The design I am creating in the course has so far been a single story building. I now show you how to add and manage levels so you can turn it into a multi story building.
When creating new levels, the walls from the level underneath are shown faded so that they can be used as a template for the new level.
After creating the new level and drawing the walls, you now have enough skills to create the doors, windows and position any furniture.
Your house is nearly finished.