The simplest way to create a beam that attaches itself and follows the curve of a roof above is by using the beam draw tools.
How to make a curved roof in revit.
This is the method that should be used once the roof geometry design is finalised and not likely to change again.
You may have to adjust its xyz location before finishing the mass which can be accomplished in plan or elevation.
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Create a simple curved roof using the roof by extrusion tool in revit.
Sloped roof on curved shape.
Attach revit beam to curved roof using the standard beam tools.
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See hd version of video tutorial here.