I split the originally drawn Gable end wall into 3 separate walls. End walls are edited to skillions, one left, one right but still at the original 1800 height.
The now middle wall is a Gable with a higher window head height (2400) with a wall height now at 3114.
Quicker than using Sketchup.
Still great if PlusSpec can add a Window in to a Gable in a future update though.