I may have used the word "Group" in the wrong context above as I was referring to the assigning of polygons in the "Group" editor to the bone rather than any group name that was present in the obj.  My understanding is that all these assignations are written to the cr2 file.  Nevertheless I tried your suggestion of exporting the model from Poser as an obj, importing the obj into Blender, renamed all references to bone_"x" and then exported it out and unfortunately nothing appears to have changed. You mentioned that I can change the polygon "group" name in the group editor but I don't see where as the properties lists both the internal name and the part name as Model_SETUP.  

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