with the roof(s) selected click on the edge(s) you want to adjust . You will get the CUSTOM EDGE dialogue box. Where the two roofs share an intersection you can set the degree of edge slope at the same time. Note that you also have the option to define what kind of a roof edge it is: rake, ridge, valley etc.
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"