Hi George,

Please, follow the explanation below with the image attached

Draw the wall--> select the wall--> properties bar (right of the screen)--> click on the wall shape icon --> the second option is the gabled wall
As you can see in the image, you can develop a symmetrical gable (red wall in the image, with the same height and pitch on both sides) or asymmetrical (green wall in the image, with the different heights and pitches on both sides)
Just adjust the values with the roof values in the appropriate fields (as showed in the image) and don't forget to press Enter after each modification in the Properties bar

Patricia