Following one previous discussion we had here https://community.osarch.org/discussion/2002/irregular-walls#latest
@moult came up with a fix of of this https://github.com/IfcOpenShell/IfcOpenShell/issues/4377
I wanted to share some screen shots of the workflow involved to add a window or skyline into a slab (or any AXIS3 element, if i've understood correctly :-))
