I need a bit of help with entity references. I have Customer Profiles entity and Credit Card entity. I'd like to be able to create "credit cards" and attach them to customer profiles so that if I click hte customer profile, I'd see any credit cards attached to them. I'm not sure how to do this. I've created the credit card content type, added a reference field to it that references the customer, but I'm not sure how to display the filtered credit card entries on the customer profile. I've tried adding an entity reference field to the customer profile back to the credit cards but don't know how to filter the results.
My brain hurts a bit at this point.