Projecting Surface to brep

Hi Guys,

I am trying to project a 2D surface on a 3D road surface that I imported from civil3D. I tried to project a polyline and create a surface or brep from projection lines but I could not. Can you please help me with this issue.
I attached my files here.

Thanks a lot.

Surface (3.2 MB)
Surface (3.7 KB)

How’s this? Since the projected curve is a polyline with many discontinuities the idea here is to look for the ones that sit at the corners where the angle is near pi/2, and then shatter at those points to get the four large edge curves…

Surface (2.8 MB)

Thanks Ethan, that helps a lot.