Converting polyline elevation specific topo site lines into a surface.

[gwcdesign7]

How do I convert polyline topo site lines into a surface, then attach the building envelope excavation elevations to calculate the actual grading quantities?

[teerawat.pSCHYQ]

Hi @gwcdesign7  it is not convert polyline to topo,  you should create Civil 3D Surface and then go to that surface in Toolspace on the Prospector tab, then go to Definition then you can use Contour for definition and then selection each polylines that you would like, you may create your surface style to showing contour lines 

[essam-salah]

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@gwcdesign7 wrote:

How do I convert polyline topo site lines into a surface, then attach the building envelope excavation elevations to calculate the actual grading quantities?

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hi, as @teerawat.pSCHYQ  mentioned just create a TINSurface out from these polylines then add whatever boundary you want to show/hide parts of that surface