Hey there,
How can I put a chimney into my room plan so that the square meterage in said room changes to reflect this?

I have a room with 2 chimney breasts inside. I have tried using the square under ‘structural’ items but this doesn’t recalculate the room area after being added. I have also tried drawing the chimneys as ‘rooms’ – this does give an accurate square meterage left in the 1st room but it seems almost impossible to get it small enough to match the chimney measurements.

All suggestions welcome!
S