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Sorry for keeping you waiting for so long @silvian !
Actually, with CASparts that's... well a pain in the ass, because with objects it basically copy/pastes the groups (TSRW I mean) but it really doesn't with CASparts.
Howeverrr Bloombase did find a way to do it, or well for 3 groups, but it should work with 2 as well. Else I would suggest just cloning an CASpart with 2 groups
:
http://modthesims.info/t/492109