Like conventional records in Fulcrum, child records - which are created from repeatable sections - can use up to 5 fields that are contained in the repeatable section to create a child record title.
To create the child record title, select the repeatable section on the app designer page. The field settings for the repeatable section will popup, then select “title.” A new popup will now be displayed allowing you to make what fields you would like to use to create the record title for the child records produced by this repeatable section.
Note: Repeatable sections are only available on select plans. Please check out the plans page to see which have access to repeatable fields.