diff --git a/demos/simple/demo.js b/demos/simple/demo.js
index 2693990..63e3e72 100644
--- a/demos/simple/demo.js
+++ b/demos/simple/demo.js
@@ -123,6 +123,14 @@ function main() {
       trackManager.addPOI(event.coordinate);
     });
   });
+
+  document.querySelector('#createNewPart').addEventListener('click', () => {
+    trackManager.createNewPart();
+  });
+  document.querySelector('#changeActivePart').addEventListener('click', () => {
+    const nextPart = (trackManager.activePart() + 1) % trackManager.partsCount();
+    trackManager.workOnPart(nextPart);
+  });
 }
 
 main();
diff --git a/demos/simple/simple.html b/demos/simple/simple.html
index 13aeb49..2b5e2ba 100644
--- a/demos/simple/simple.html
+++ b/demos/simple/simple.html
@@ -51,7 +51,11 @@
       <a href="#" id="reverse">reverse</a>
       <br />
       <a href="#" id="addPoi">Add poi</a>
-  </div>
+      <br />
+      <a href="#" id="createNewPart">Add a new line string</a>
+      <br />
+      <a href="#" id="changeActivePart">Change active line string</a>
+    </div>
     <div id="map"></div>
   </main>
 </body>
diff --git a/demos/simple/style.js b/demos/simple/style.js
index 5729a70..fbada9f 100644
--- a/demos/simple/style.js
+++ b/demos/simple/style.js
@@ -12,6 +12,8 @@ export const sketchControlPoint = {
 export const trackLine = {
   "stroke-width": 6,
   "stroke-color": "purple",
+  "text-value": ["concat", "", ["get", "part"]],
+  "text-fill-color": "#fff",
 };
 
 export const trackLineModifying = {
@@ -27,7 +29,7 @@ export const poiPoint = {
   "text-font": "bold 11px Inter",
   "text-fill-color": "#000",
   // use 'concat' to convert number to string
-  "text-value": ["concat", ["get", "index"], ""],
+  "text-value": ["concat", "", ["get", "part"]],
 };
 
 export const numberedControlPoint = {
@@ -35,7 +37,7 @@ export const numberedControlPoint = {
   "circle-fill-color": "#ffffffdd",
   "text-color": "blue",
   // use 'concat' to convert number to string
-  "text-value": ["concat", ["get", "index"], ""],
+  "text-value": ["concat", "", ["get", "part"]],
 };
 
 export const snappedTrue = {
diff --git a/package-lock.json b/package-lock.json
index fd609cf..c7d9d8f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@geoblocks/edittrack",
-  "version": "1.3.17",
+  "version": "2.0.0-beta.15",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@geoblocks/edittrack",
-      "version": "1.3.17",
+      "version": "2.0.0-beta.15",
       "license": "BSD-3-Clause",
       "devDependencies": {
         "@geoblocks/elevation-profile": "0.0.20",
@@ -419,62 +419,6 @@
         "@lit-labs/ssr-dom-shim": "^1.2.0"
       }
     },
-    "node_modules/@lmdb/lmdb-darwin-arm64": {
-      "version": "2.8.5",
-      "resolved": "https://registry.npmjs.org/@lmdb/lmdb-darwin-arm64/-/lmdb-darwin-arm64-2.8.5.tgz",
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-      "cpu": [
-        "arm64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "darwin"
-      ]
-    },
-    "node_modules/@lmdb/lmdb-darwin-x64": {
-      "version": "2.8.5",
-      "resolved": "https://registry.npmjs.org/@lmdb/lmdb-darwin-x64/-/lmdb-darwin-x64-2.8.5.tgz",
-      "integrity": "sha512-w/sLhN4T7MW1nB3R/U8WK5BgQLz904wh+/SmA2jD8NnF7BLLoUgflCNxOeSPOWp8geP6nP/+VjWzZVip7rZ1ug==",
-      "cpu": [
-        "x64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "darwin"
-      ]
-    },
-    "node_modules/@lmdb/lmdb-linux-arm": {
-      "version": "2.8.5",
-      "resolved": "https://registry.npmjs.org/@lmdb/lmdb-linux-arm/-/lmdb-linux-arm-2.8.5.tgz",
-      "integrity": "sha512-c0TGMbm2M55pwTDIfkDLB6BpIsgxV4PjYck2HiOX+cy/JWiBXz32lYbarPqejKs9Flm7YVAKSILUducU9g2RVg==",
-      "cpu": [
-        "arm"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ]
-    },
-    "node_modules/@lmdb/lmdb-linux-arm64": {
-      "version": "2.8.5",
-      "resolved": "https://registry.npmjs.org/@lmdb/lmdb-linux-arm64/-/lmdb-linux-arm64-2.8.5.tgz",
-      "integrity": "sha512-vtbZRHH5UDlL01TT5jB576Zox3+hdyogvpcbvVJlmU5PdL3c5V7cj1EODdh1CHPksRl+cws/58ugEHi8bcj4Ww==",
-      "cpu": [
-        "arm64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ]
-    },
     "node_modules/@lmdb/lmdb-linux-x64": {
       "version": "2.8.5",
       "resolved": "https://registry.npmjs.org/@lmdb/lmdb-linux-x64/-/lmdb-linux-x64-2.8.5.tgz",
@@ -489,20 +433,6 @@
         "linux"
       ]
     },
-    "node_modules/@lmdb/lmdb-win32-x64": {
-      "version": "2.8.5",
-      "resolved": "https://registry.npmjs.org/@lmdb/lmdb-win32-x64/-/lmdb-win32-x64-2.8.5.tgz",
-      "integrity": "sha512-4wvrf5BgnR8RpogHhtpCPJMKBmvyZPhhUtEwMJbXh0ni2BucpfF07jlmyM11zRqQ2XIq6PbC2j7W7UCCcm1rRQ==",
-      "cpu": [
-        "x64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "win32"
-      ]
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       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/@mischnic/json-sourcemap/-/json-sourcemap-0.1.1.tgz",
@@ -518,62 +448,6 @@
         "node": ">=12.0.0"
       }
     },
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-      "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-darwin-arm64/-/msgpackr-extract-darwin-arm64-3.0.3.tgz",
-      "integrity": "sha512-QZHtlVgbAdy2zAqNA9Gu1UpIuI8Xvsd1v8ic6B2pZmeFnFcMWiPLfWXh7TVw4eGEZ/C9TH281KwhVoeQUKbyjw==",
-      "cpu": [
-        "arm64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "darwin"
-      ]
-    },
-    "node_modules/@msgpackr-extract/msgpackr-extract-darwin-x64": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-darwin-x64/-/msgpackr-extract-darwin-x64-3.0.3.tgz",
-      "integrity": "sha512-mdzd3AVzYKuUmiWOQ8GNhl64/IoFGol569zNRdkLReh6LRLHOXxU4U8eq0JwaD8iFHdVGqSy4IjFL4reoWCDFw==",
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-      "optional": true,
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-      "integrity": "sha512-fg0uy/dG/nZEXfYilKoRe7yALaNmHoYeIoJuJ7KJ+YyU2bvY8vPv27f7UKhGRpY6euFYqEVhxCFZgAUNQBM3nw==",
-      "cpu": [
-        "arm"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ]
-    },
-    "node_modules/@msgpackr-extract/msgpackr-extract-linux-arm64": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-linux-arm64/-/msgpackr-extract-linux-arm64-3.0.3.tgz",
-      "integrity": "sha512-YxQL+ax0XqBJDZiKimS2XQaf+2wDGVa1enVRGzEvLLVFeqa5kx2bWbtcSXgsxjQB7nRqqIGFIcLteF/sHeVtQg==",
-      "cpu": [
-        "arm64"
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-      "dev": true,
-      "license": "MIT",
-      "optional": true,
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-        "linux"
-      ]
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       "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-linux-x64/-/msgpackr-extract-linux-x64-3.0.3.tgz",
@@ -588,20 +462,6 @@
         "linux"
       ]
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-    "node_modules/@msgpackr-extract/msgpackr-extract-win32-x64": {
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-      "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-win32-x64/-/msgpackr-extract-win32-x64-3.0.3.tgz",
-      "integrity": "sha512-x0fWaQtYp4E6sktbsdAqnehxDgEc/VwM7uLsRCYWaiGu0ykYdZPiS8zCWdnjHwyiumousxfBm4SO31eXqwEZhQ==",
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-      "optional": true,
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       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -1965,153 +1825,6 @@
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-      "resolved": "https://registry.npmjs.org/lightningcss-linux-arm-gnueabihf/-/lightningcss-linux-arm-gnueabihf-1.26.0.tgz",
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-        "url": "https://opencollective.com/parcel"
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-    "node_modules/lightningcss-linux-arm64-gnu": {
-      "version": "1.26.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-linux-arm64-gnu/-/lightningcss-linux-arm64-gnu-1.26.0.tgz",
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-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/parcel"
-      }
-    },
-    "node_modules/lightningcss-linux-arm64-musl": {
-      "version": "1.26.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-linux-arm64-musl/-/lightningcss-linux-arm64-musl-1.26.0.tgz",
-      "integrity": "sha512-XxoEL++tTkyuvu+wq/QS8bwyTXZv2y5XYCMcWL45b8XwkiS8eEEEej9BkMGSRwxa5J4K+LDeIhLrS23CpQyfig==",
-      "cpu": [
-        "arm64"
-      ],
-      "dev": true,
-      "license": "MPL-2.0",
-      "optional": true,
-      "os": [
-        "linux"
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-      "engines": {
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-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/parcel"
-      }
-    },
     "node_modules/lightningcss-linux-x64-gnu": {
       "version": "1.26.0",
       "resolved": "https://registry.npmjs.org/lightningcss-linux-x64-gnu/-/lightningcss-linux-x64-gnu-1.26.0.tgz",
@@ -5028,48 +4426,6 @@
         "url": "https://opencollective.com/parcel"
       }
     },
-    "node_modules/lightningcss-win32-arm64-msvc": {
-      "version": "1.26.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-win32-arm64-msvc/-/lightningcss-win32-arm64-msvc-1.26.0.tgz",
-      "integrity": "sha512-X/597/cFnCogy9VItj/+7Tgu5VLbAtDF7KZDPdSw0MaL6FL940th1y3HiOzFIlziVvAtbo0RB3NAae1Oofr+Tw==",
-      "cpu": [
-        "arm64"
-      ],
-      "dev": true,
-      "license": "MPL-2.0",
-      "optional": true,
-      "os": [
-        "win32"
-      ],
-      "engines": {
-        "node": ">= 12.0.0"
-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/parcel"
-      }
-    },
-    "node_modules/lightningcss-win32-x64-msvc": {
-      "version": "1.26.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-win32-x64-msvc/-/lightningcss-win32-x64-msvc-1.26.0.tgz",
-      "integrity": "sha512-pYS3EyGP3JRhfqEFYmfFDiZ9/pVNfy8jVIYtrx9TVNusVyDK3gpW1w/rbvroQ4bDJi7grdUtyrYU6V2xkY/bBw==",
-      "cpu": [
-        "x64"
-      ],
-      "dev": true,
-      "license": "MPL-2.0",
-      "optional": true,
-      "os": [
-        "win32"
-      ],
-      "engines": {
-        "node": ">= 12.0.0"
-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/parcel"
-      }
-    },
     "node_modules/lines-and-columns": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.2.4.tgz",
@@ -5385,27 +4741,6 @@
         "node": ">= 14.0.0"
       }
     },
-    "node_modules/mocha/node_modules/glob": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-8.1.0.tgz",
-      "integrity": "sha512-r8hpEjiQEYlF2QU0df3dS+nxxSIreXQS1qRhMJM0Q5NDdR386C7jb7Hwwod8Fgiuex+k0GFjgft18yvxm5XoCQ==",
-      "deprecated": "Glob versions prior to v9 are no longer supported",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "fs.realpath": "^1.0.0",
-        "inflight": "^1.0.4",
-        "inherits": "2",
-        "minimatch": "^5.0.1",
-        "once": "^1.3.0"
-      },
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
     "node_modules/mocha/node_modules/minimatch": {
       "version": "5.1.6",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-5.1.6.tgz",
@@ -6221,6 +5556,52 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/rimraf/node_modules/brace-expansion": {
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "node_modules/rimraf/node_modules/glob": {
+      "version": "7.2.3",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.3.tgz",
+      "integrity": "sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==",
+      "deprecated": "Glob versions prior to v9 are no longer supported",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "fs.realpath": "^1.0.0",
+        "inflight": "^1.0.4",
+        "inherits": "2",
+        "minimatch": "^3.1.1",
+        "once": "^1.3.0",
+        "path-is-absolute": "^1.0.0"
+      },
+      "engines": {
+        "node": "*"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
+    "node_modules/rimraf/node_modules/minimatch": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
+      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "brace-expansion": "^1.1.7"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/run-parallel": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",
@@ -6313,14 +5694,13 @@
       }
     },
     "node_modules/shiki": {
-      "version": "1.16.1",
-      "resolved": "https://registry.npmjs.org/shiki/-/shiki-1.16.1.tgz",
-      "integrity": "sha512-tCJIMaxDVB1mEIJ5TvfZU7kCPB5eo9fli5+21Olc/bmyv+w8kye3JOp+LZRmGkAyT71hrkefQhTiY+o9mBikRQ==",
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/shiki/-/shiki-1.14.1.tgz",
+      "integrity": "sha512-FujAN40NEejeXdzPt+3sZ3F2dx1U24BY2XTY01+MG8mbxCiA2XukXdcbyMyLAHJ/1AUUnQd1tZlvIjefWWEJeA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@shikijs/core": "1.16.1",
-        "@shikijs/vscode-textmate": "^9.2.0",
+        "@shikijs/core": "1.14.1",
         "@types/hast": "^3.0.4"
       }
     },
diff --git a/package.json b/package.json
index a8ac38a..671d80b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@geoblocks/edittrack",
-  "version": "1.3.17",
+  "version": "2.0.0-beta.15",
   "description": "Geoblocks edittrack",
   "scripts": {
     "eslint": "eslint src test demos",
diff --git a/src/interaction/TrackData.ts b/src/interaction/TrackData.ts
index f5b7bcd..29e25f3 100644
--- a/src/interaction/TrackData.ts
+++ b/src/interaction/TrackData.ts
@@ -31,10 +31,19 @@ interface DeletedControlPoint {
 }
 
 export default class TrackData {
+  private part_: number;
   private segments: Feature<LineString>[] = [];
   private controlPoints: Feature<Point>[] = [];
   private pois: Feature<Point>[] = [];
 
+  constructor(part: number) {
+    this.part_ = part;
+  }
+
+  get part() {
+    return this.part_;
+  }
+
   parseFeatures(features: Feature<Point|LineString>[]): ParsedFeatures {
     const parsed: ParsedFeatures = {
       segments: [],
diff --git a/src/interaction/TrackInteraction.ts b/src/interaction/TrackInteraction.ts
index c04c69c..6b04efd 100644
--- a/src/interaction/TrackInteraction.ts
+++ b/src/interaction/TrackInteraction.ts
@@ -18,7 +18,6 @@ import {Point} from 'ol/geom';
 export interface Options {
   map: Map;
   trackLayer: VectorLayer<VectorSource>
-  trackData: TrackData
   style: StyleLike | FlatStyleLike
 
   /**
@@ -64,6 +63,10 @@ export default class TrackInteraction extends Interaction {
   private modifyTrack_: Modify;
   private deletePoint_: Select;
 
+  setTrackData(trackData: TrackData) {
+    this.modifyTrack_.setTrackData(trackData);
+  }
+
   controlPointOrPOIAtPixel(pixel: Pixel): Feature<Point>|false {
     return this.getMap().forEachFeatureAtPixel(pixel,
       (f) => {
@@ -88,9 +91,8 @@ export default class TrackInteraction extends Interaction {
     return draw;
   }
 
-  createModifyInteraction(trackData: TrackData, source: VectorSource, style: StyleLike | FlatStyleLike, hitTolerance: number): Modify {
+  createModifyInteraction(source: VectorSource, style: StyleLike | FlatStyleLike, hitTolerance: number): Modify {
     const modify = new Modify({
-      trackData: trackData,
       source: source,
       style: style,
       condition: (event) => !this.deleteCondition_(event),
@@ -156,7 +158,7 @@ export default class TrackInteraction extends Interaction {
     source.on('removefeature', () => requestAnimationFrame(() => this.modifyTrack_.updateSketchFeature()));
 
     this.drawTrack_ = this.createDrawInteraction(source);
-    this.modifyTrack_ = this.createModifyInteraction(options.trackData, source, options.style, options.hitTolerance);
+    this.modifyTrack_ = this.createModifyInteraction(source, options.style, options.hitTolerance);
     this.deletePoint_ = this.createSelectInteraction(options.trackLayer);
 
     this.setActive(false);
diff --git a/src/interaction/TrackInteractionModify.ts b/src/interaction/TrackInteractionModify.ts
index f757b19..b363bbd 100644
--- a/src/interaction/TrackInteractionModify.ts
+++ b/src/interaction/TrackInteractionModify.ts
@@ -6,7 +6,7 @@ import LineString from 'ol/geom/LineString.js';
 import Point from 'ol/geom/Point.js';
 import Event from 'ol/events/Event.js';
 import {Geometry} from 'ol/geom';
-import TrackData from './TrackData';
+import type TrackData from './TrackData';
 import {Map, MapBrowserEvent} from 'ol';
 import type {StyleLike} from 'ol/style/Style.js';
 import type {FlatStyleLike} from 'ol/style/flat.js';
@@ -32,7 +32,6 @@ export class ModifyEvent extends Event {
 
 export interface Options {
   source: VectorSource<Feature>;
-  trackData: TrackData;
   style: StyleLike | FlatStyleLike;
   condition: (mbe: MapBrowserEvent<UIEvent>) => boolean;
   addControlPointCondition: (mbe: MapBrowserEvent<UIEvent>) => boolean;
@@ -65,7 +64,7 @@ export default class Modify extends PointerInteraction {
   });
   private overlay_: VectorLayer<VectorSource>;
   private lastPixel_: Pixel = [0, 0];
-  private trackData_: Options['trackData'];
+  private trackData_: TrackData;
   private pointAtCursorFeature_ = new Feature<Point>({
     geometry: new Point([0, 0]),
     type: 'sketch',
@@ -103,10 +102,16 @@ export default class Modify extends PointerInteraction {
       updateWhileAnimating: true,
       updateWhileInteracting: true
     });
+  }
 
-    this.trackData_ = options.trackData;
+  setTrackData(trackData: TrackData) {
+    this.trackData_ = trackData;
+    this.overlayFeature.set('part', this.trackData_.part);
   }
 
+  featureInTrackData(feature: Feature<Geometry> | undefined) {
+    return feature?.get('part') === this.trackData_.part;
+  }
 
   setMap(map: Map) {
     this.overlay_.setMap(map);
@@ -181,6 +186,11 @@ export default class Modify extends PointerInteraction {
 
   handleEvent(event: MapBrowserEvent<UIEvent>): boolean {
     const stop = super.handleEvent(event);
+    // const feature = this.getFeatureAtPixel(event.pixel);
+    // if (feature?.get('part') !== this.trackData_.part) {
+    //   return false;
+    // }
+
     if (this.addControlPointCondition_(event)) {
       const feature = this.getFeatureAtPixel(event.pixel);
       if (feature && feature.get('type') === 'segment') {
@@ -201,6 +211,10 @@ export default class Modify extends PointerInteraction {
     if (!this.feature_) {
       return false;
     }
+    if (!this.featureInTrackData(this.feature_)) {
+      this.feature_ = null;
+      return false;
+    }
     this.dragStarted = false;
     return true;
   }
diff --git a/src/interaction/TrackManager.ts b/src/interaction/TrackManager.ts
index 7894c56..ab7dc34 100644
--- a/src/interaction/TrackManager.ts
+++ b/src/interaction/TrackManager.ts
@@ -1,3 +1,5 @@
+// FIXME: move pois outside of track data
+
 import Feature from 'ol/Feature.js';
 import Point from 'ol/geom/Point.js';
 
@@ -97,7 +99,7 @@ export default class TrackManager<POIMeta> {
   private trackChangeEventListeners_: Function[] = [];
   // eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
   private trackHoverEventListeners_: Function[] = [];
-  private trackData_ = new TrackData();
+  private trackData_: TrackData;
   private router_: Router;
   get router(): Router {
     return this.router_;
@@ -114,6 +116,7 @@ export default class TrackManager<POIMeta> {
   private updater_: TrackUpdater;
   private interaction_: TrackInteraction;
   private historyManager_ = new HistoryManager<Feature<Point|LineString>[]>();
+  private parts: TrackData[] = [];
 
   constructor(options: Options) {
     this.map_ = options.map;
@@ -127,16 +130,15 @@ export default class TrackManager<POIMeta> {
     this.snapper_ = options.snapper;
     this.profiler_ = options.profiler;
     this.densifier_ = options.densifier;
+
     this.updater_ = new TrackUpdater({
       profiler: this.profiler_,
       densifier: this.densifier_,
       router: this.router_,
-      trackData: this.trackData_
     });
 
     this.interaction_ = new TrackInteraction({
       style: options.style,
-      trackData: this.trackData_,
       trackLayer: this.trackLayer_,
       map: this.map_,
       deleteCondition: options.deleteCondition,
@@ -145,6 +147,8 @@ export default class TrackManager<POIMeta> {
       hitTolerance: this.hitTolerance_,
     });
 
+    this.createNewPart();
+
     // Hack to test profile synchro
     // this.closestPointGeom_ = new Point([0, 0]);
     // this.interaction_.modifyTrack_.overlay_.getSource().addFeature(new Feature({
@@ -163,6 +167,7 @@ export default class TrackManager<POIMeta> {
       if (!this.snapping) {
         feature.set('snapped', false);
       }
+      feature.set('part', this.trackData_.part);
       // Next line we don't care if the control point will be snapped, or not.
       const {pointFrom, pointTo, segment} = this.trackData_.pushControlPoint(feature);
       if (this.snapping && this.snapper_) {
@@ -170,6 +175,7 @@ export default class TrackManager<POIMeta> {
       }
       if (segment) {
         this.source_.addFeature(segment);
+        segment.set('part', this.trackData_.part);
         await this.router_.snapSegment(segment, pointFrom, pointTo);
         this.updater_.equalizeCoordinates(pointFrom);
 
@@ -183,6 +189,7 @@ export default class TrackManager<POIMeta> {
 
     const debouncedMapToProfileUpdater = debounce(
       (coordinate: Coordinate, hover: boolean) => {
+      // FIXME multi lines: check this
       if (hover && this.trackData_.getSegments().length > 0) {
         const segments = this.trackData_.getSegments().map(feature => feature.get('profile'));
         const best = findClosestPointInLines(segments, coordinate, {tolerance: 1, interpolate: true});
@@ -210,22 +217,26 @@ export default class TrackManager<POIMeta> {
         const type = event.feature.get('type') as FeatureType;
 
         if (type === 'POI') {
-          this.trackData_.updatePOIIndexes();
+        // FIXME multi lines: check this
+        this.trackData_.updatePOIIndexes();
           this.onTrackChanged_();
         } else if (type === 'controlPoint') {
           const feature = event.feature as Feature<Point>;
           await this.updater_.updateAdjacentSegmentsGeometries(feature, this.snapping);
           this.updater_.changeAdjacentSegmentsStyling(feature, '');
           await this.updater_.computeAdjacentSegmentsProfile(feature);
+          // FIXME multi lines: check this
           this.trackData_.updatePOIIndexes();
           this.onTrackChanged_();
         } else if (type === 'segment') {
           const feature = event.feature as Feature<LineString>;
+          // FIXME multi lines: check this
           const indexOfSegment = this.trackData_.getSegments().indexOf(feature);
 
           console.assert(indexOfSegment >= 0);
           const controlPoint = new Feature({
-            geometry: new Point(event.coordinate)
+            geometry: new Point(event.coordinate),
+            part: this.trackData_.part,
           });
           this.source_.addFeature(controlPoint);
           const removed = this.trackData_.insertControlPointAt(controlPoint, indexOfSegment + 1);
@@ -234,11 +245,14 @@ export default class TrackManager<POIMeta> {
 
           const {before, after} = this.trackData_.getAdjacentSegments(controlPoint);
           console.assert(!!before && !!after);
+          before.set('part', this.trackData_.part);
+          after.set('part', this.trackData_.part);
           this.source_.addFeatures([before, after]);
 
           await this.updater_.updateAdjacentSegmentsGeometries(controlPoint, this.snapping);
           this.updater_.changeAdjacentSegmentsStyling(controlPoint, '');
           await this.updater_.computeAdjacentSegmentsProfile(controlPoint);
+          // FIXME multi lines: check this
           this.trackData_.updatePOIIndexes();
           this.onTrackChanged_();
         }
@@ -254,6 +268,7 @@ export default class TrackManager<POIMeta> {
         console.assert(selected.getGeometry().getType() === 'Point');
         const type = selected.get('type') as FeatureType;
         if (type === 'POI') {
+          // FIXME multi lines: check this
           this.trackData_.deletePOI(selected);
           this.source_.removeFeature(selected);
           this.onTrackChanged_();
@@ -266,6 +281,7 @@ export default class TrackManager<POIMeta> {
 
           // add newly created segment to source
           if (newSegment) {
+            newSegment.set('part', this.trackData_.part);
             this.source_.addFeature(newSegment);
           }
 
@@ -299,10 +315,11 @@ export default class TrackManager<POIMeta> {
   }
 
   private pushNewStateToHistoryManager_() {
-    const segments = this.getSegments();
-    const controlPoints = this.getControlPoints();
-    const pois = this.getPOIs();
-    const features = [...segments, ...controlPoints, ...pois];
+    const features = [
+      ...this.getAllSegments().flat(),
+      ...this.getAllControlPoints().flat(),
+      ...this.getAllPOIs().flat(),
+    ];
     const clonedFeatures = features.map(f => {
       const nf = f.clone();
       nf.setId(f.getId());
@@ -369,6 +386,7 @@ export default class TrackManager<POIMeta> {
 
   deleteLastPoint() {
     if (this.mode_) {
+      // FIXME multi lines: check this
       if (this.trackData_.getControlPoints().length > 0) {
         const deletedFeatures = this.trackData_.deleteLastControlPoint();
         deletedFeatures.forEach(feature => this.source_.removeFeature(feature));
@@ -402,6 +420,7 @@ export default class TrackManager<POIMeta> {
   private clearInternal_() {
     this.source_.clear();
     this.trackData_.clear();
+    // FIXME multi lines: remove all parts ?
   }
 
   /**
@@ -418,17 +437,23 @@ export default class TrackManager<POIMeta> {
    */
   private async restoreFeaturesInternal_(features: Feature<Point|LineString>[]): Promise<void> {
     // should parse features first, compute profile, and then replace the trackdata and add history
-    const parsedFeatures = this.trackData_.parseFeatures(features);
-    this.source_.addFeatures(features);
-    const profileRequests = parsedFeatures.segments.map((segment) =>
-      this.profiler_.computeProfile(segment)
-    );
-    await Promise.all(profileRequests);
-    this.trackData_.restoreParsedFeatures(parsedFeatures);
+    const currentPart = this.activePart();
+    const featuresByPart = Object.groupBy(features, f => f.get('part'));
+    for (const [part, featuresInPart] of Object.entries(featuresByPart)) {
+      const parsedFeatures = this.trackData_.parseFeatures(featuresInPart);
+      this.source_.addFeatures(featuresInPart);
+      const profileRequests = parsedFeatures.segments.map((segment) =>
+        this.profiler_.computeProfile(segment)
+      );
+      await Promise.all(profileRequests);
+      // FIXME: check if part exists
+      this.workOnPart(parseInt(part));
+      this.trackData_.restoreParsedFeatures(parsedFeatures);
+    }
+    this.workOnPart(currentPart);
   }
 
   async restoreFeatures(features: Feature<Point|LineString>[]): Promise<void> {
-    this.clearInternal_();
     await this.restoreFeaturesInternal_(features);
     this.onTrackChanged_();
   }
@@ -465,6 +490,29 @@ export default class TrackManager<POIMeta> {
     });
   }
 
+  getAllSegments(): readonly Feature<LineString>[][] {
+    const segments: Feature<LineString>[][] = [];
+    for (const tm of this.partsGenerator()) {
+      segments.push(tm.getSegments() as Feature<LineString>[]);
+    }
+    return segments;
+  }
+
+  getAllControlPoints(): readonly Feature<Point>[][] {
+    const controlPoints: Feature<Point>[][] = [];
+    for (const tm of this.partsGenerator()) {
+      controlPoints.push(tm.getControlPoints() as Feature<Point>[]);
+    }
+    return controlPoints;
+  }
+
+  getAllPOIs(): readonly Feature<Point>[][] {
+    const pois: Feature<Point>[][] = [];
+    for (const tm of this.partsGenerator()) {
+      pois.push(tm.getPOIs() as Feature<Point>[]);
+    }
+    return pois;
+  }
 
   /**
    * Add a POI and notify track change listeners.
@@ -614,4 +662,42 @@ export default class TrackManager<POIMeta> {
     this.source_.changed();
     this.shadowTrackLayer_.getSource().changed();
   }
+
+  createNewPart(): number {
+    this.trackData_ = new TrackData(this.parts.length);
+    this.parts.push(this.trackData_);
+    this.updater_.setTrackData(this.trackData_);
+    this.interaction_.setTrackData(this.trackData_);
+
+    return this.trackData_.part;
+  }
+
+  activePart(): number {
+    return this.trackData_.part;
+  }
+
+  partsCount(): number {
+    return this.parts.length;
+  }
+
+  workOnPart(index: number) {
+    this.trackData_ = this.parts[index];
+    this.updater_.setTrackData(this.trackData_);
+    this.interaction_.setTrackData(this.trackData_);
+  }
+
+  getParts(): TrackData[] {
+    return this.parts;
+  }
+
+  // FIXME: find a better name
+  *partsGenerator(): Generator<TrackManager<POIMeta>, void> {
+    const currentPart = this.activePart();
+    const length = this.partsCount();
+    for (let i = 0; i < length; i++) {
+      this.workOnPart(i);
+      yield this;
+    }
+    this.workOnPart(currentPart);
+  }
 }
diff --git a/src/interaction/TrackUpdater.ts b/src/interaction/TrackUpdater.ts
index 782445d..e8e472e 100644
--- a/src/interaction/TrackUpdater.ts
+++ b/src/interaction/TrackUpdater.ts
@@ -7,7 +7,6 @@ import {equals} from 'ol/coordinate';
 import {Densifier} from 'src/densifier';
 
 type TrackUpdaterOptions = {
-  trackData: TrackData;
   densifier: Densifier;
   router: Router;
   profiler: Profiler;
@@ -23,12 +22,15 @@ export default class TrackUpdater {
   private router: Router;
 
   constructor(options: TrackUpdaterOptions) {
-    this.trackData = options.trackData;
     this.densifier = options.densifier;
     this.profiler = options.profiler;
     this.router = options.router;
   }
 
+  setTrackData(trackData: TrackData) {
+    this.trackData = trackData;
+  }
+
   computeAdjacentSegmentsProfile(modifiedControlPoint: Feature<Point>): Promise<any> {
     const promises = [];
     if (modifiedControlPoint) {
diff --git a/tsconfig.json b/tsconfig.json
index a1b4525..ffd1ffa 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,7 +2,7 @@
   "compilerOptions": {
     "target": "ES2022",
     "module": "ES2022",
-    "lib": ["es2023", "dom"],
+    "lib": ["ESNext", "dom"],
     "baseUrl": "./",
     "skipLibCheck": true,