AFAIK GoZ will only send info on the vertex positions - so no go for new groups or UV data. When I've created a figure in the past, after I had the obj file in the Geometries and the cr2 pointed to it, I replaced that obj with a modified version without problems on several occasions. Obviously backups are important ;)

Also, I think the Group Editor in Poser has a mirror option, but I don't have it open right now to check.

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