Is there a way to link two custom properties together?

Under my custom properties I would like to have two properties that are linked together. For example I select a customer name and it automatically assigns the customer address to that name. Currently I have a list (linked to an excel file) with all of our vendors in it. I would like to auto-populate a custom property of "Cage Code" based on which vendor is selected. Is there a way to do this without writing a macro?? (1. I have no experience/knowledge writing macros, 2. I have to get IT back over to install the API portion of the software onto my machine).  I a running Solidworks 2014.  I would greatly appreciate any help on this!

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