You can also draw them as walls in plan, then stand them up and save them as an object in the 3D window.
I know, it's a workaround, but it works until GS gives us real 3D mitering.
Yep that's how I got round the problem bit of a pain should the boss (and he frequently does) change his mind about the facade of a building and we need to show him an updated version of the facade for him to decide if he likes it or not.
The facade I'm currently working on has 6 storeys of completely unique sized windows in length (least they are all the same height) something like 50-60 windows all of which have gone through more than 10 versions of facade and he's about to do it again! After all I just have to press the magic button and it will be done instantly
If I had the time I would do it as a window object but what with three different glazing systems and various spandrel panels and internal linings etc it is much easier to do as a Complex Profile.
I see you are using AC 11 so I assume that this feature hasn't been added then?
AC versions 3.41 to 25 (UKI Full 5005).
Using AC25 5005 UKI FULL
Mac OSX 10.15.7 (19G2021) Mac Pro-2013 32gbRam AMD FirePro D500 3072 MB graphics