I've tried to create one... many, many years ago. I find the best solution is to create an empty opening and place in individual doors. Save an EMPTY OPENING with all the SCHEDULING PARAMETERS so you can use it in your schedule.
It's a crappy answer for sure, but seems I have less and less time to dig into gdl anymore.
You can do this with CadImage Door & Window Builder easily. I have never tried a corner one but will give it a try and let you know.
Gerald "The simplification of anything is always sensational" GKC AC 25-4013 USA, CadImage Tools 2019 MacBook Pro 16" w/ AMD Radeon Pro 5600M GPU OS X 11.6 2.4 Ghz 8 core i9, 64 GB RAM 27" LG 5K Monitor
(regarding the corner condition - i've only been able to produce one with a corner post. you can model it without so that it appears the whole corner slides back, but this involves butchering the plan/elevation/schedule. i have the same problem now for the building in the screenshot. i've been trying to figure it, but no luck yet...)
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archicad | sketchup! | coffeecup
cheers guys.. we dont have cadimage.. il have to see if the bos is willing to hand over more $$ for us to buy it. i had a look on there website and i can see they have quite a few other tools worth having.