Actually you don't want to cut the cylindric Section zone label object.
As I said, in order to have a label attached, it must visible.
You can have the cylinder attached to your dimension object, the label can than read the GLOB_ID more easily.
The zone-relations request does not read the glob Id of the zone.
I did see the room-dimension also
here, you migth want to post a wish about it, because I don't know how to make it.