If you want to change the position of the roof use the properties palette to edit the base level and offset properties to change the position of the reference plane.
Four sided gable roof revit.
The reference plane in the sketch indicates where the 4 sided gable roof stops.
The opposite arrangement to the half hipped roof.
The following example shows a roof that you can create in revit using a slope arrow.
Edit the roof sketch select the roof and click modify roofs tabmode panel edit footprint or edit profile.
A hybrid of hipped and gable with the gable wall at the top and hipped lower down.
For instructions see creating a sloped surface using a slope arrow.
You can use slope arrows to create slopes on a roof.
After creating a roof you can change its shape or overhang cut openings or align ridges.
Overhanging eaves forming shelter around the building are a consequence where the gable wall is in line with the other walls of the buildings that is unless the upper gable or gables is.