I would like help making a shopping cart auto populate

I have several photography order forms but I can't, for the life of me, figure out how to get my shopping cart to auto-populate when people make their selections. People are bad at counting and I lose out on some sales or it causes me customer service hassles. 

Thank you!

Just to clarify, you want to populate the product field with values selected from the previous fields?

If yes, unfortunately, this isn't possible if you're already selling products in the payment field. You will have to switch it to "User Defined Amount" so you can pass the total price from the calculation field to the payment field.

So basically, if you want to use regular fields as product selections, you will have to calculate the total price using form calculation. And then after that, you can pass the total price to the payment field for the payment.

Demo: https://form.jotformpro.com/41413741780956

Is this what you want to achieve? Please let us know if not so we can assist you further.