You can add a single object that does not contain any related objects. You can add multiple objects that have an explicit relationship defined in Salesforce. For example, if you use the Opportunity object as a source, you can add the related Campaign as well. You can also add the RecordType object because it is related to the Campaign object. All Salesforce objects in a multiple-object source must have a predefined relationship in Salesforce.

If you select multiple source objects, you can choose an object and add the related parent, child, and self-reference objects manually. When a source object references to itself within a task, it is called self-reference relationship.

When you select multiple source objects, you can download the subset graph from the

Source

page to view the relationships between the related objects.