How can I create several pages for the products when using the Paypal Pro?

I am using Paypal Pro for the checkout / payment option. I offer many products. I do not want all of the products to show on one page because it will be too much for the end user to see all at once.

How can I create different pages for each category?

Unfortunately what you are trying to achieve is not possible. Payment is representing 'one field' and you can no separate field on few pages.  

If you wish to have your form organized in more than one page, you can go to "Survey tools" and than add a "page break" right before the Paypal payment (this way you'll get a "next" page button) and your payment will be located on separate page. 

Hope this will help. Let us know if you need further assistance.