Z-order sorting for qualifier/group

[Boba Fonts]

I have a perspective floor, with a certain number of objects (characters, furniture, etc.) all with the qualifier "Group.Physical Objects", and they're all on the same layer.
I need to sort them based on their baseline value: not necessarily it's the same as their actual y value, since an object may be up in the air and not on the ground.
So their baseline value is always set to actual Y + z-baseline (0 if it's a character walking on the ground, more if it's "levitating" or simply hanging by the ceiling).
I know the Layer object can sort objects by an alterable value, but how? And does it work with qualifiers?

[LB]

It works with qualifiers.

How: Layer Object -> Sort -> By ALT VAL

[Boba Fonts]

But where I tell it to pick that group of objects? It only asks for the value. Maybe in the conditions?

[LB]

It sorts ALL objects. If you don't want objects to be sorted, just sort all objects, then put the objects you want back to the way they were before.

[Boba Fonts]

Fine, thank you!