@hoffmeistermaex, well it’s been a while since I posted this, so my memory is not entirely fresh. I think archicad23 does support rhino 6 files meanwhile.
But as you can read above in @furtonb’s response it’s not that there’s one solution to this. There are at least several ways. The hotlinking was actually pretty smooth for my purpose. Remember to refresh them, 
I have worked on some ac-gh stuff meanwhile it’s pretty neat, but requires two screens (otherwise you go mad) and a but of gh knowhow. But when you want something done like parametric facades that’s the way forward! Worked quite nicely for me. The only issue is that you have to be careful when baking things to archicad. If you updated your definition in gh, some of the existing geometry (even baked) in actually gets lost. So make sure to copy those elements once in archicad and potentiallyremove their gh element ID. But that only applies if you want to keep geometry that you have already generated even if you twitch the gh definition.
What is you exact application of this, what to do you want to do with your rhino data in archicad?