I think the Curtain Wall tool is indeed the best tool for this job.
Try to do it with the Curtain Wall.
Then when you get stuck, post the problem with screenshots and we will try to help you with it.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac27