Form Calculation Widget: Customize Product Selection

I am trying to calculate each section where there is an option so when my clients get to the my products page they do not have to recheck their select

You can use standard fields to display your product and price.

Then a form calculation field to total the selected products.

How-to-Perform-Form-Calculation-Using-a-Widget 

Finally you pass the amount to a payment integration.

How-to-Pass-a-Calculation-to-a-Payment-Field