Subtractive Brush type not working?

[fatmarrow]

@AbhorDeities;515724

I’m trying to make a doorway. I have copied the previous wall. Re-sized it to a suitable door size. I changed the type to subtractive. When trying to move it into my wall, it doesn’t remove that piece of the wall. Any insight would be appreciated. I am using BSP’s by the way.

Off the top of my head, are the brushes in the correct order?