I'll have to run some tests to answer more completely, but... You CAN us the grouping tool to 'spawn (new) props', so that would create duplicate geometry, or it might (in the case(s) you're reffering to) replace the external .obj file reference with imbedded geometry (ie. custom geom), but what I've seen in the past was an alteration of the base .obj file when I saved my altered figure. Again, I'm speaking from memory on some of this, so I'll look into it further.

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