Use the Room Separation Line tool to add and adjust room boundaries.
Room separation lines are room-bounding. They are useful for designating one room within another, such as a dining area within a living room, where a wall between the rooms is not desired. Room separation lines are visible in plan views and 3D views.
If you create a room bounded by walls, the room area is computed from the inside face of the walls by default. If you add openings to those walls and still want to maintain separate room area computations, you must sketch room separation lines through the openings to maintain the room area as it was first computed.
