I created a balcony room at the same floor height as the stair landing inside, which is 67". I have tried to turn the foundation into a pony wall and it makes a mess... I have tried to break an adjacent wall and drag it under the landing/balcony but it isn't allowing me to break the wall... Any other suggestions? I would like to draw a wall under as you suggest but There is already a wall occupying the 2d space... I tried checking the box roof splits wall / lower wall. maybe chief thinks the balcony is a roof but that didn't work either.