Partial vaulted ceiling help

[jacpdx]

Hi, I am attempting to draw a portion of the ceiling in this plan vaulted, the rest flat. I think I figured most of it out, but I don't know how to build the interior gable wall where the vault meets the flat. Guidance is much appreciated. 

 

Plan is attached. I used "Export Disconnected Plan"; let me know if that is not the correct method. 

 

Thanks,

John

Studio.plan

[javatom]

Draw a wall in the attic that aligns to the flat ceiling plane.  Click on the wall and define it as an attic wall.  That should do what you are looking for.

[jacpdx]

I think that worked, had some issues getting it drawn... but it looks like its there now.  Thanks!