This does help. Thank you. I will start down that path. This will save me the hours it will take to define all the different rule bases for the order guide and make my catalog much simpler.

So we are having similar questions around how do manage the line of service associated with an iPhone or MIFI device.   Any help would be great.   The info above is great.  

Are you looking for a way to track the mobile phone contract? Is that what you mean?

yes trying to link a line of service to the device, without creating another record

Similar to what Laurence posted earlier, couldn't you add the mobile phone number to the CI?