The initial list of objects to be synced is provided by the associated consumer profile and displayed on the Sync Settings page. When you need to add new objects or fields to the sync or update the existing data structure, you can do so from Sync Settings. You have the option to add simple (single object with no joins) or complex objects (single object with one or more joins). When adding new objects or managing existing objects, you can also select which fields to include or exclude from the sync operation.