How to project 3D polyline onto 3D surface

[LuckyL93]

Hello, I have started approaching the Python library ezdxf. I was trying to perform the following operation: I have closed 3D polylines in a 3D space. In the same 3D space, I have loaded an irregular and extensive surface. I would like to be able to project the 3D polylines onto this surface. The objective is to start with a 3D closed polyline and have a 3D curved surface (or even a 3D polyline) that follows the irregular shape of the large surface. Thank you very much in advance.