Can I sculpt a group of OBJs I have a group of OBJs (imported with vert order and poly groups intact),  specifically two upper arms and I want to sculpt one and have it mirrored on the other, but I do not want to combine them into a single OBJ, because I need to  export them separately, with their original vert order poly groups still intact.  

I have them grouped, but when I go to sculpt mode I only have one OBJ selected,  and I can't seem to sculpt anything. 

I'm probably missing something real obvious, or maybe trying to accomplish  something undo-able. 

Any insight is appreciated.
Okay  a little trial and error,  and I've figured this out.  I need to export both  objects together from  the original program(not Blender),  keep  the vert order,  and poly groups intact. Import into  Blender, still keeping everything intact. 

Go  ahead and sculpt it as I normally would.  Save the file, and delete one half of the object,  and then export that(also  keeping vert  group order,  and poly groups).  Do  NOT save.  Close the file, open it back up  and delete the other side and export.  I now have the original two models,  right and left,  with  all internal  names intact.