The product-to-parent product relationship is a self-referential hierarchy. The parent product ID refers to the product id of another record on the product table. Within the Zaius app, there is reporting on parent product names, id, images, etc, as well as the ability to bring these parent products dynamically into emails based on qualifying products. These parent product values are set by querying for the product id that is referred to in the parent product id field of a target product. A parent product name, for example, is the name field in the product record with the same id referenced as the parent product id on the child record. The highest level parent in the hierarchy should reference its own product id as the parent product id. As a best practice, parent product ids should reference actual products that are included on the product object.