Thank you Kbird
Not using the break wall tool first is where I was going wrong.
I was trying to change the pitch on the gable end wall.
I spent several days using the reference manual, users guide and the Home designers web site.
It is a matter of asking the correct question to finding the answers in the available sources.
My house was built in 1935 and has a ceiling height of 88 inchs upstairs and downstairs.
I had not changed the ceiling height upstairs after making the 1 1/2 story because I had redrawn the house muiltiple times trying to find the problem.