We use our own customised library parts.
They were based on on standard Archicad ones from version 6.5 but have been modified and altered since.
New ones created as the need arises.
If we don't have a library part that works then we resort to the "make it out of slabs and save as a door/window object" approach.
Barry.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11