Want to create a flat ceiling 18' up

[nhhandyman]

I have attached a jpg with red lines on it - that is where I want to place a flat ceiling over this room.

The ceiling will actually be the height of the second floor on the right side of the structure.

 

Do I need to chop up/create a room below to do this?  It is in effect a single room.

 

And if you want to comment on how I can adjust the roofline on the back right I wouldn't mind some help there also.

 

Thanks - Brian (profile should say I'm running suite 2020 on Windows 10)

want-flat-ceiling.plan

[DavidJPotter]

Now that you have the roofs in place (turn OFF Auto Rebuild Roofs), all you need to is to open the "Room Specification Dialog" for that room on the first floor and on the "Structure Tab" of that Dialog, set the "Ceiling height" to raise the ceiling to 18', then the ceiling will rise to 18' and the roof planes should stay put.

 

DJP

[nhhandyman]

Thanks - the roof is OK in that area - the back right is still messed up - but the left is more important.