A half hip roof has two gable ends. At the top of each gable is a hip that extends to the ridge.
To convert the gull wing roof to a half hip
Click on the floor plan view window to make it the active view.
Click the Roof Tools
parent button, then Delete Roof Planes .
With the Select Objects
tool, double-click each wall and make these changes on the Roof tab of the Wall Specification dialog:
For the two horizontal walls, make the Lower Pitch 6 in 12 and uncheck the Upper pitch check box.
For the two vertical walls, leave the Full Gable Wall box selected. Check the Upper Pitch check box. Make the Upper Pitch 3 in 12 and set the Start Height to 144 inches.
Click the Build Roof
tool, check Build Roof Planes, and click OK in the Build Roof dialog.