I am trying to recreate a house to show how it would look updated.  It is a Cape with a shed dormer.  I followed the knowledge base article on creating a shed dormer, but as you can see in the picture, the back wall of the shed dormer is a continuation of the first floor back wall and in my design the walls are separate.  I cannot figure out how to make these the same wall.  I am using Home Designer Pro 2019.