Raising Base Height of Center Gable

[Txcustom]

Hello

I am looking for a way to raise up the center wall and gable to make the center gable have a little different from the two side gables. Just looking to make the front wall under that gable about 2' taller. I have tried raising the ceiling heights in the room under this gable but that did not resolve the issue. I also tried manually adjusting this gable but that didn't seem to work either. Home Designer Pro 2024 

Thanks in advance. 

[y-g-m-n]

floor plan?

 

Ceiling height in those rooms that gable side walls include should have done what you want.