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That's one of the biggest faults of Civil 3D. Most of the coordinate system control is through Map 3D and Map will not handle Civil 3D objects. I believe you might be able to do something by exporting the Points and Surface to LandXML and importing them in to a new drawing. I pretty much only use CorpsCon for transforming Points.
Allen
Allen Jessup
CAD Manager - Designer
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It may not apply to you if you're not in North America, but there may be the equivalent in your area. CorpsCon is a free program by the US Army Corps of Engineers. The files it uses for transformation are the ones Autodesk includes with Map and Civil. I export point files, use CorpsCon to transform them and then Import them. One great thing is that it handles all the vertical transformations very well.
Allen
Allen Jessup
CAD Manager - Designer
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