svdl, that is brilliant!! Thank you so much!

Whenever I wanted to delete a portion of a Poser object in Vue, I edited the mesh and split the object (if there was anything that could be split). :p Many times, I was surprised to find groups that weren't represented even in Poser's material room.

But your method answers the question I've had all along : what can I do when the splitting option is greyed out in Vue? Now I know. :P Thankees!