Thanks for the replies!
To model a double wall is not my case.
I don't model the exterior walls nor the slabs in the hotlinked file. But when you stack them in the main file, then inevitably you have a first and last room, which are surrounded by external walls. So then you have again two walls overlapping.
So, i was thinking maybe it is better to model only the internal partitions, furniture and zone in the hotlink file, and then add the walls in the main file.
Or is it too much work for nothing?
Mac OSX 13.6.4 | AC 26 INT 3001 FULL