Create Subforms for Child Records
In many cases a stream record is a master record that can have multiple child records. For example, an Inspection record could have a child record for each area that was inspected. Some inspections might then have many child records, while others have only a few, depending on the number of areas there were to inspect.
When the form for the master record appears, you want users to have the ability to add child records at the same time. Those records appear in a subform.
To create the subform: