1) Make sure the geometry is good. In the past, Autocad geometry was a bit "etch-a-sketch" - line ends are not coincident, fillets don't quite touch the lines they are filleting, etc. A good check is set your modeling tolerance relatively tight (.0001" or .00001") and try to select "connected curves", see if they chain/connect.
Or do analysis->Distance and get the distenace between the END POINTS of the (supposedly) "connected" curves.
If bad, easiest solution might be to import the curves into a sketch, apply dimensions, then make all the endpoints coincident.
2) If geometry needs to be modified (e.g. add fillets/rounds) you could add to sketch, or revolve sketch & add fillets/rounds to solid
3) If you just want to use the curves...
In turning, (CAM) "geometry" view, you typically see
--- Workpiece (where you would usually select the solid)
------ Turning Workpiece - edit this one
4) Click on te icon to select or edit the part (or blank) boundary
5) Selection method -> Curves; select as desired
Production: NX10.0.3.5 MP16/TC11.2
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A good check is set your modeling tolerance relatively tight (.0001" or .00001") and try to select "connected curves", see if they chain/connect.
I think the value with the most impact on this is "Preferences => Selection => Chaining => Tolerance", at least was it that way a while back, when selection intent was first introduced.
Production: NX10.0.3, VERICUT 8.2, FBM, MRL 3.1.7 | TcUA 10.1 MP7 Patch 0 (10.1.7.0) | TcVis 11.4
Development: C (ITK), .NET, Tcl/Tk Testing: NX12.0 | AWC 3.4 Preparing: NX12.0
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