Underground Interior Walls

Hi there,

I’m working in a model that includes a basement.
I tried to set the boundary condition to AIRWALLS or InteriorWall for every partition. However, the underground zones (below the XY plane) do not seem to recognize that. On the contrary, all of them are labeled ExteriorWall. I also tried to separe zones by Floor to isolate the basement, but it doesn’t have interior walls that I can edit. Everything there is just undergroundWalls.

Any Idea or suggestion to manipulate the interior walls of the basement?

Can you share a Gh file with relevant part of your definition?

Also, can you setup a profile picture please?