unwanted walls in plan, needed in elevation

[GintOtis]

I didn't know how to describe my issue, so if this kind of question has been posted somewhere, please point me to the solution.

 

When building the box window on the 2nd floor, i discover walls up on the 3rd floor above, which, thinking that making them invisible would be OK in plan, results poorly on the exterior...

 

 

what's the proper way of getting rid of unwanted walls in plan but not in elevation?

 

thanks!

 

 

[GintOtis]

Yes. That worked for the walls, thanks, but... it didn't show everything:

 

 

there isn't a separate layer for just the frieze, is there?