I have a contour file, and a corridor of the same area of motorway (carriageway). I have received 3D information in CAD format (non Civil 3D format) and I now need to raise one channel up to tie into these new levels.
What would be the best way of doing this - amending a previously created Corridor, creating a surface on the Contours dwg or doing it all from scratch?
Civil 3D newbie, so be gentle.
Cheers