We currently use opportunities (renamed service contracts) to record our customers and the Gas contract that they have agreed to with us. However, when a different vendor submits a new contract for that same customer we create a new service contract. We want a way to have any service contract with the same phone number show in a related list view on each service contract. Additionally, we are beginning to sell a new product and have created a new object. (Electric Service Contracts) We want these customers who have the same phone numbers to show up in another related list view section on the service contract and vice versa on the electric service contract. So that both the gas service contracts and electric service contracts will have gas and electric contracts with the same phone numbers listed in two separate sections on each. Salesforce has recommended creating a trigger to accomplish this but I am a little lost on exactly what I need to do from here. I can link them together using a lookup field but this allows me to only link one account. Any assistance in much appreciated! -Update: I have since talked to Salesforce and they have informed that it is not possible to link Parent to Parent.