In situations where rooms are at different heights, like an entry lobby space, follow these steps to create multi-height spaces on one level:
Select Room.
Change the height properties of one wall (this will change the height of all wall properties associated with that room).
For more information, watch this short video:
Important Notes:
Each room can only have 1 height.
If modeling over two levels, check the 3D view to observe where roofs have been automatically generated.
Related Articles
Introduction to the drawing.tool interface
Modeling using a 2D drawing in drawing.tool
How to make a building in the drawing.tool?