Hey there @Drakgoku! Technically, you can’t really just designate faces alone, however you can use anchors to stop the destruction of a volume of what you choose. Controlled destruction requires a bit more work in this sense. You could just anchor the back and bottom of the stair/chair and that’d work, but if you were thinking piece by piece destruction a la Red Faction Guerilla, you’d be looking at multiple geometry collections or even a custom destruction system.