Referencing data keys between objects

Is there a way to reference data keys between objects? For example I’ve created a network drawing with a list of routers, switches and servers. Each of these objects has a data key for the hostname and the ip address. I would like to reference those data keys elsewhere in the document. Can this be done?

Did you ever get any further on that?
I have the same sort of requirements.
Adding cost for each links and then adding them up in a table somewhere.

No response yet.