Is there any way to have product/payment options on two different pages on an order form?

I want to first have package options on the 'Packages' page, which are required. Then I want to offer additional items on the 'Add-Ons' page which are not required to submit the order. Is there any way to do this?

You can only achieve that when you use regular fields ex. multiple choice(checkbox ) as your products so you can separate them into pages. Then perform calculation to get the total of the selected products. After that, pass the total calculation field to the payment field for the actual payment.

Here's a guide for that which also covers limited stocks https://www.jotform.com/help/426-How-to-Setup-a-Payment-Order-Form-with-Limited-Stocks

If you need further assistance with that, let us know.