My processing to this kind of problem:
1. Create layer to curtain wall with different intersection priority
2. Insert an empty window to define overall hole in the structural wall. Give the windows ID to the hole (eg. O-05 as see in your plan)
3. Create profile to curtain wall. This profile specify the glass and the horizontal mullions. Give the windows ID to the wall too if you want to schedule CWs (eg. O-05 as see in your plan)
4. Use profiled column to vertical mullions with stronger priority than glass and mullion of profiled wall
5. Insert individual curved windows to CW to define sash. Set height and width dimension to inserted windows. If you constrain the sill to the actual storey you will get a right sill height to individual sash (see attached picture)
6. Create section/elevation from the curtain wall to generate elevations to CW specification layout
7. Save new floor plan view to CW specification layout
8. Compose CW specification drawing on worksheet (by pmk) or layout
It seems somewhat complicated but you have a full control of CW geometry and inserted windows and it worked before CW tool arrived to ARCHICAD.
Personally i have never used the built-in CW tool.
regards,
Zoltan
i7-4770K / 16GB / GTX560 2GB / 512GB SSD / Win10 64bit
AC21 (HUN-64 bit) / Bimx Pro / Revit 2017