Creating an object label for the current location

Any subsystem can create an object label reference for its owning portal
using the routine operation Label->Create SubSystem Label.

This is very useful in cases where a parent portal has been dynamically
copy/pasted and a portal contained therein needs to also be referenced using
an object label reference. A routine executing within this other subsystem
can allocate and obtain a label reference for that subsystem and store it
in an attribute, in effect creating a "handle" to that subsystem.

This helps avoid having to copy/paste systems in layers in order to get
label references to subsystems deeper in the hierarchy which is copy/pasted

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idkbase note 43