by TerryS » Tue Sep 01, 2009 8:59 pm
In the Civil module, on the 3D Data menu, 2d to 3d polyline, there is "by points' (or command line: 2dto3dpt).
This routine asks for an offset tolerance, then you select the objects.
Depending on what kind of results you are looking for, another option would be to solve a surface from the points then 2d to 3d the polyline from the surface.