Visio 2013 how do I use shape data from another shape?

I am new to Visio.  I have made a master shape (Cisco Switch) which contains multiple shapes 24 of them are each ethernet port.  What I want to do is in the shape data for the main shape have each port listed and populated with what is connected to it.  Now here is where I am having trouble.  Each of the ethernet ports have their own shape data.  I would like to copy the data from the main shape data into the port shape data.  I hope my formula below exaplains it better :)

(Ethernet Port Shape)  Prop.Function.Value  =  (Main Shape) Prop.Port1.Value

And then in turn change the comment in the Ethernet Port Shape Data to be  Prop.Function so when I hover over each ethernet port it would then display that data.

Any help would be appreciated.

Thanks
Daryll