trim to roof window

[Anonymous]

Hi
I'm new to ArchiCAD and as trying to work on some project I came to this problem with placing windows to gable wall. I attached the picture where are two windows trimmed to roof. The roof in fact catted corners of them, but this is what I don't want. I sketched with purple lines, what I want the window look like. Sorry, my english doesn't allow me to explain it better, but I hope someone could give me answer how to create window like that.

[Anonymous]

Roman,
The window type you want is called a trapezoid window.
In the AC 8.1 and AC 9 window library there is a window
called w trapezoid fix.
Peter Devlin