Firstly the original post was using the old listing schemes - there has been no change to these since then.
However even with the Interactive Schedules, it seems that there is no relation between a slab and a zone, so the field 'Related Zone' does nothing for slabs.
This is the same even in 22.
However in 22 there is a new field 'Colliding Zones'.
This does work but the zone has to overlap just a little with the slab.
So if you have a floor slab with the top at 0mm (zero), then your zone will have to start at -1mm for the collision to occur.
Why slabs don't have a related zone I have no idea.
James, now you are "on the inside" do you have any answers?
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11