JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Do you mean you want the user to be able to select the products from a single list before going to payment? If that is indeed what your concern is about, then you can check out this PayPal guide to learn how to add multiple products: PayPal Forms. You can also use this template for multiple products with multiple choices: Multiple products with multiple choices template.
Do inform us if you need further assistance with selecting the products,