How do I remove an all-in-one exterior?

I submitted a bug request but it isn't actually a bug as it turns out -- but I'm still stuck. I want to remove an all-in-one housing exterior and replace it with individual pieces. But I don't know how to remove it. When I just try to add in the pieces individually (individual walls, roof, etc.) it doesn't preview and says "Unable to Confirm" -- hence my thinking it was a bug.

Do I actually need to buy all of the individual parts in addition to just wall and roof?

The 'basic' fixture set is Roof, Wall, Window, and Door, so you'll need to have something set in all four of those component slots in order to unequip an all-in-one housing set.

Can confirm, if you swap out all 4 the change will go through and the all in one goes back to your inventory as a single item. Then you can try the mix and match styles to see if you like any of those setups.

Ohh I see, thank you!