Change overall wall height on each floor

[daweaver]

I initially thought I'd want the walls on both levels to be 10 ft, but due to the new design of roof and vaulted ceilings, I no longer need the walls to be any higher than a standard 8 ft on main floor. Would like to also change lower floor to 9 ft. How can I do that without starting from scratch again? Am using Home Designer Architectural 2023.