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.
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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?