Thanks a lot for your answer. I'm still in AC25 waiting AC26 ARM SPA, but the door library object is the same in AC25 and 26.
The solution is 90 % suitable but it still appears a frame between the higher and lower part of the door.
I replied your instructions in AC25 and 26 and the frame is still there
In any case it's much more useful than the way I was drawing those doors.
ARCHICAD 25 SPA