Not sure if this is what you are looking for:

- wall 100 cm thick
- insert windows 50 cm thick, using arrow keys
- import triangle as door/window
- triangle dimensions 50 cm wide, 50 cm thick
- insert triangle using arrow keys
- windows can be moved without windows changing thickness

see result in linked file
[url=https://www.mediafire.com/file/iwkwf6lgcbbv3of/wall_%252B_window.sh3d/file

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