How to automatically advance to next field in Adobe forms

I am creating a form from an existing PDF document using Adobe X Standard. How do you set it up to automatically advance from one field to the next upon entering text or selecting a radio button, etc.? For instance, the form requires entering the user's SSN. The form is set up for filling out by hand, so each number is in its own box. If I want to type 123-45-6789 as the SSN, how do I do that as one text string but have the numbers populate the individual boxes shown on the form? Thanks!