Hey Ken
I don't know if what I'm about to offer helps any at all but I copied the original window, made the adjustments, then put it in place. Here are some screenshots showing changes to specifications. Now if the roof pitches were different (for some reason) then I would have probably placed a window under the roofline, matched pitch then copy, adjust, place and delete the original. If it helps glad it did, if not....well it was worth a try.