Multiple submit buttons

I need to have two or more submit buttons on my form - each of which submits the form and appends a different value (yes/no) to a specific field.

Is this possible?

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?