How do I make combinations of fields to create total to be charged?

I was trying to create a form that was similar to the shop on gigiglambox.com, but i was having trouble getting the calculated while somebody was picking choices from the drop box. I also wanted to connect my paypal to the checkout.

To do that, you should check out this guide: How to pass a calculation to a payment field

It will show you how to get the values through different fields and then pass the value to the payment tool for the change to be made.

Do feel free to let us know however if you have any questions along the way and we would be happy to assist with the same.