Split room along selected edge

This function allows you to split a room into two rooms along a selected line. This line should have been created using Draw a line.

27.  Click Split room along selected edge in the sub-screen Rooms of the menu bar, or press Shift+S.

28.  Click the line segment in the drawing at which you want to split the room. You can generate these line segments using Draw a line.

29.  The room is split into two separate rooms. The splitting plane is perpendicular to the face which contains the line segment.