Add Associated Items Tab

If each type of asset could have a section that showed all items it is associated with, by virtue of connections with other items. For example, I could have the following logical connections between items:

Computer-Phone-SIM-Contract

I'd like to be able to see the Contract (Phone Number), within the computer's properties. Or from the Contract's properties, see the SIM, Aircard and Computer. Bonus if it could show you the logical connections, in the case that a single computer has multiple aircards or an aircard has multiple SIMs.

Computer1-Phone1-SIM1-Contract1

Computer1-Phone1-SIM2-Contract2

Computer1-Phone2-SIM3-Contract3

Currently I have to click through each item to figure out what line of service is on the computer I am working on.