Revit has some incredibly useful features that can be used to good effect to simplify the design process of some complex elements. I am particularly partial to creating trusses at interesting angles and of differing lengths. This is illustrated in the video below where a roof is extruded at an angle to a building. Then one truss is created and its top aligned with the roof. It is shown how steel sections are applied to then truss and how individual members may be overridden. If you want to design a more varied roof structure with ridiculous ease, use this method. Consider coming on training with Micrographics to learn about this and other interesting Revit skills.