Forms set up

Hi!

1. How are forms linked between different wp-pages. Ex 1-Contact, 2-Product, 3-Order (submit)? The reason for this would be to divide the forms, not having to scroll too much on each page plus to have a better overview for each step. On the last page (3-Order) the submit button is placed – when clicked the info on all three pages is gathered and sent to the mail.

2. How to use a design class with forms. Where in the code is the specific class entered to be able to change the form-appearance?

Thanks!