You must do 2 separate trims whether you use SEO or Trim-to-Roof. Once to select the wall and roof below to trim the bottom of the roof, and then again select the wall and the upper roof to trim the top of the wall.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"