JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
If I understand your question correctly, you want to add a auto-generated unique number in every submission. Is that correct?
Yes it is possible to achieve your requirement by adding "Unique ID" widget in your form. Please note that unique id widget will also allow you to customise the auto-generated number by adding prefix. You may also like to take a look at the following guide which should help you: https://www.jotform.com/help/79-How-to-Add-Custom-Unique-IDs-to-your-Form-Submissions
Hope this helps.
Do get back to us if you have any questions.