How do I adjust the height of a shorter, connected room while keeping the connecting wall's height to match the taller rooms?

[ChiefUserKirkL]

The main 'room' of my building is 34' tall and I am trying to build off of it a room that is 16' tall. When I adjust the connecting rooms' height to be 16', the program automatically shrinks the connecting wall's height to match this, even when I click the 'Balloon Through Ceiling Above' option in the connecting walls' specification. 

 

I've tried changing the wall's type to be a pony wall but the wall still stay's at 16' and therefore I cannot edit the upper half of the wall to extend beyond that to the 34' total height I am trying to set it to be. 

 

Another detail to note, and why I think this wall type need's to be a pony wall, is that I am needing the exterior portion of the wall that extends beyond the 16' height to the 34' tall height to be (so the upper 18' exterior portion) to be a different wall type than what's in the interior of the room so that it matches the exterior of the rest of the building. 

 

I'm a beginner to this program so I understand this is probably a 'basic' question but cannot seem to find an answer in any of the training videos.  

[Mark3D]

Not sure what I am looking at but if that is a roof plain on the lower section that will stop wall the going to full height, you will need to drag it to the other side of the wall, if not upload your plan file so someone can help you.

[kellyh]

Without seeing your plan I can't say for sure but this might be a situation where you make two floors and have the second floor be an open below room. Set the first floor rooms to all be 16' tall and then create a second floor over just the taller area but make it's absolute elevation 32' and change the room type to Open below to remove the floor from the second floor and have it open to the first floor.