Filled out a form to go back into the form at a later date and update it

I am creating a catering order form for my office and would like my colleagues to be able to return to their submission and update it with an rsvp list.

Yes, this is possible by using a feature named save and continue later. Please check our guide: https://www.jotform.com/help/97-How-to-Save-Forms-and-Continue-Later

Also, you can try this guide: https://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date. Keep in mind you need an email field to your form for the autoresponder.

If you need further assistance, please contact us again. We'll be happy to help you.

Thank you.