How To Look Up Previous Entries with Gravity Forms
Populate values from previous Gravity Forms entries when a user inputs matching values from that entry.
gp unique id
Require an Existing Value for Submission with Gravity Forms
Ensure that a value entered in Form B has been previously submitted (or generated) on Form A. This is useful if you’re generating a reference number of some sort on Form A and would like the user to enter it on Form B.