How can I give a customer the option to add multiple sizes of one product to their order in the payment field?

We have a lengthy product list we are creating an order form for.  Within each product I have a quantity and size option with specific pricing set up.  However, it does not allow the customer to select multiple sizes and quantities of that product.

For example, if I wanted to order 1 2lb Product A and 1 6lb Product A, there is seemingly no way to select both within the single product - just one or the other.  

Please let me know if there is a way to do this without creating multiple Product As for each available size.  Thanks!

Yes, there is a way to accomplish the scenario you describe, please follow this guide which contains an example.

https://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form

You can get back to this thread to request more assistance if needed.