Mario,
Wouldn't you want the walls to show on the roof terrace level?
For the Roof Plan, use either the story above so you are looking down on the roof.
Or a new view of that same level with the cut plane for the view adjusted so you look down on the roof.
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"