I'm not sure i understand your query but here goes anyway:
select the object in the elevation view and apply a label to it and it will show the ID of the object. the defaut is an arrow to the ID but if you select another type can just be text next to the object.
the object needs to be activated in each elevation view, Applying the label in the plan doesnt effect the elevation.
Cheers John
John Hyland : ARINA : www.arina.biz
User ver 4 to 12 - Jumped to v22 - so many options and settings!!!
OSX 10.15.6 [Catalina] : Archicad 22 : 15" MacBook Pro 2019 [/size]