First idea: You can duplicate your original wall group and then when you finish ungroup all the unwant groups.
Second idea: unlock your wall group, select the pieces from the group (but not the group) and duplicate/locate/duplicate, etc. The parts will be added in the same parent group. This solution is probably the one I would use.

Hi,

thanks for the hints. It does not really work due to my "grouping" (I striped down my wall to 3 subgroup: lower wall, higher wall and promenade. Since the pieces I showed have part belonging to 2 of the groups, it turns out a bit more difficult.

I kept a copy at one corner of my workspace. It is not elegant but allowed mw to work quite fast.

Thanks again 😉

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