I am trying to put a window on the large gable end of this building. How do I go about this as there is no second floor on this building?
One way to do it is to edit the roof edge and add a gable vent and then edit
the vent to the window you desire. Another way is to uncheck gable wall provided by roof
and edit your wall to fit to roof. You should then be able to add your window and offset it to where you need it.