If you need to form the edge of a roof in traditional domestic construction so that tile or slate finishes can oversail fascia and gutter. You can use two hosted sweeps using the roof fascia sweep tool. One fascia will be a standard fascia, the second will be a trim that follws the angle of the roof (angle and dimensions are parametric).
This image shows a completed example.
I have used join geometry to join the roof edge hosted sweep to the roof geometry and it looks quite neat. The gutter and fascia are best added first and then the edge trim as an additional fascia type last, simply because it tends to mask the edge that you will select for the other sweeps.
Using the join geometry tool wil ensure that the extra sweep shows correctly in all views, including the section shown.
The profile family I have used is attached. Thanks to LMSmith at Autodesk for the tweak that made it work!
