I always have to group a wall and create a prop from it, which I then parent to the main prop. Then I go back into that group (in the main prop) and give it its own material, which I make transparent. I do this (rather than just deleting the polygons using the group tool) so the texture mapping on the main prop doesn't go wacky (whacky is the original spelling, fwiw). Whether or not I can delete them all depends on how the main prop is textured. I usually have to do a second wall, too. It's a pain, but walls don't have a lot of polygons, so I'm not adding a lot of extra polys to the scene.

I always appreciate when creators make removable walls.

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W11,Intel i9-14900KF @ 3.20GHz, 64.0 GB RAM, 64-bit, GeForce GTX 4070 Ti SUPER, 16GB. 

Old lady hobbyist.

All visual art or fiction is "playing with dolls."