Building a shop. exterior wall height vs interior wall height

[cvse346]

Sorry That I have not gotten back to your post. I am using Home Designer Suite 6. I am still having the same problem with making interior wall heights different than exterior wall heights.
I ran in to a new problem today . I am tring to build a split level plan.

Question : making one building. How do I make a roof at two different heights. for example a split level home.

In advance Thank you