Create Angled window opening in plan view

[StephenJ]

I am working on an old stone house with angled window openings(see attachment). The wall is 21" thick. 20" stone w/ 1" metal mesh lath and plaster. I drew this in cad and am trying to get the same results in revit. The opening is only angled in plan view so the cut is parallel in elevation.

How can I create the angled opening? Can this be solved with the window unit or is there a command that will trim the corners in revit?

Thanks
http://i1227.photobucket.com/albums/ee430/SteveJ33/AUGI/WindowOpenings.jpg

[Joshua Kohl]

You could use Voids in your window family in place of the Opening, note that voids and openings can't be used at the same time. You could also use masking regions in the window family if you only require it to be seen in 2D.