Can I set up a payment integration without creating the products within the integration?

I want products to appear in a few columns, instead of going down the page into eternity.

I do not see a way to adjust the field widths. I can create as many columns as I want, but I'm not able to move products up into the other columns, it just makes a skinny column all the way down the page.

You can create the products using basic fields instead, for example, using drop downs, text boxes and images elements if needed, this guide will provide more info about the available fields: https://www.jotform.com/help/46-Quick-Overview-of-Form-Fields 

Then you will need to manually perform the calculations, the following guides will provide you more info about it: 

https://www.jotform.com/help/259-How-to-Perform-Form-Calculation-Using-a-Widget

https://www.jotform.com/help/301-How-to-Assign-Calculation-Value

https://www.jotform.com/help/275-How-to-Pass-a-Calculation-to-a-Payment-Field

If you have questions, let us know. 

thanks. Do you think this is a simpler way to create a form that looks more customized? I'm trying to put several items next to each other, instead of on top of each other, and I can't do it. Maybe creating products in the basic fields instead would give more ability to customize?

Can I still clone these forms and use a choice a payment type if I create everything outside of the payment integration?

Yes, although if you have CSS knowledge you can also customize the payment integration, I mean, you can still set up the products and then customize the section with CSS code, this guide will help you injecting the developed code: https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

Yes, you can still use the payment field if you want, you can also pass the calculated amount to the payment field as explained on the guide shared before.