title: Core Data Relationships having a header entity on entities with common attributes
body: <p>I have 3 types of entities (Job_A, Job_B, and Job_C) and each of them has a different attribute from one another. However, I would like to create an entity (e.g. "Job") that will act like as the header table that links to the 3 types of jobs I have said, containing the common attributes of the three jobs. The header entity (Job) will be my main entity to be linked to other entities like workers, or payments, etc. And this (Job) entity will be the only entity linked to the 3 types of jobs I made, for this (Job) entity will hold / determine what type of job (A, B, C) needs to be called or whatever.</p>