I think I mean the same as Joe,
In Wysiwig, there is the concept of naming a truss or pipe as a position, that allows you to groups things by it. so it becomes a named group of items. that you can report against. THe key here being its named. and can consit of items from more than one layer.
so "FOH bar 1" "truss 1"
so for example in the fixture report you could sub group based on position so when you give the report to a crew they know what quantiy of each lantern are going to hang on which bar from the report without needing a plan as well
I think this is what Joe is after.