Hi Brian, give this utility a try:
http://moi3d.com/wiki/Resources#SeparateOBJ_editor
If you run your OBJ file through that SeparateOBJ.exe program, it will re-label some parts inside of it, and that may get Carrara to recognize different pieces without messing around with shading domains.
I'm not sure if it will work but it is worth a try...
- Michael
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