Hi,

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:
http://usa.autodesk.com/adsk/servlet...linkID=9240697

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.

Thanks.

Jeremy