Wall finish as tiles

I created own wall finished node as generic model tiles that is created in this room. Work only if you have wall with higher than tiles…

Now I have in a room smaller walls. I need to create tiles on the wall and also behind wall… Tiles is as generic model based wall.

My idea is check boundary wall and create tiles on this small wall and then uncheck wall parameter room bounding and then check room boundary without this small walls and create tiles and then cut with small walls…
BUT …can’t in one way get small room bounding(with small wall) and big bounding room ?
Any other idea??


thx.