Hi @Anonymous
Two easy ways:
1. You could create a face-based family and insert your windows inside it (nested family).
2. Create a Angled Curtain wall and change its panel to be the windows panel you want to.
You have to built custom family. See attached for sample how to built custom angle window.
Nice window @syman2000 !
ps. I thin @Anonymous wanna place the window in an angled vertical wall (on section view) instead on floor plan view
Thank you
Thank you very much and that you for the attached file.
This is exactly what I have been trying to do.