Adding and duplicating related records
You can add records to a related table when you enter data in a record in the current table.
Click New Record in the status toolbar.
If the related field is in a portal, type data into the field in the last row of the portal, then commit the record (for example, by clicking anywhere outside the record or selecting another record).
Note  You can only add related records from the current table if the relationship has been defined to allow the creation of related records. If a related table is in a write-protected file, or the user doesn't have access privileges to create records, FileMaker Pro doesn't add new records.
Related topics 
Adding and duplicating records
Deleting records
Protecting databases