I'm new to Civil3D, but I've managed to create a surface from a pointcloud and attach a dwg that contains an ESRI shape file (polylines of building footprints).
In order to give the polylines in the ESRI shape file elevation values I followed this:
Worked great. The building footprints now have a Z value.
The problem is that I get this warning every time the drawing autosaves-
"The association between the queried objects in the current and attached drawings will not be retained once the current drawing file is closed."
When I close the drawing will I lose the work I've done? ...or do I no longer need the associated attached file.