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.
I am not entirely sure if I understood your concern correctly.
You can place multiple submit buttons on your form, that will allow your users to submit the form easily, let's say you have a submit button on page 1, you also have a submit button on page 2. Your users can simply submit the form by clicking the submit button on page 1.
Here's a sample form with two submit buttons: https://form.jotform.com/61783846777980
Could you please provide us more information on what you would like to accomplish? What do you mean when you say append a different value?