What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
There are 2 Widgets that you can use to add an Order# like data in your form.
1. Unique ID widget - http://widgets.jotform.com/widget/autoincrement
Check this guide on how to setup the Unique ID
2. Calculation widget - http://widgets.jotform.com/widget/calculation
The Calculation widget will let you create your own custom Order# using calculations.
Check this user guide for calculation formulas http://www.jotform.com/help/267-Form-Calculation-Math-Function-Reference
Hope this help. Inform us if you need further assistance.