No compatibility between C3D objects (e.g. profiles, labels, surfaces) in different versions (cynics would suggest that it is a way for Autodesk to "encourage" upgrades/subscription but I couldn't possibly comment on that...!!!). You could explode all the objects but then you lose all the intelligence and they become plain AutoCAD entities (text, blocks etc)
The help files and tutorials are also very good, as is the stuff on AutoDesk University (search for Civil 3D) and the "Mastering Civil 3D 2011" looks useful (http://www.amazon.co.uk/Mastering-AutoCAD-Civil-3D-2011/dp/0470884185/ref=sr_1_1?s=books&ie=UTF8&qid...)
neilyj (No connection with Autodesk other than using the products in the real world)
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AEC Collection 2026 UKIE (mainly Civil 3D UKIE and IW)
Win 11 Pro x64, 1Tb Primary SSD, 1Tb Secondary SSD
64Gb RAM Intel(R) Xeon(R) W-11855M CPU @ 3.2GHz
NVIDIA RTX A5000 16Gb, Dual 27" Monitor, Dell Inspiron 7760