Is there a calculating function?

2) Is there a calculating function? For example if a customer is ordering and selecting options it gives a running total.

Yes, the form builder has a calculating function which you can find on the Conditions and/or adding a form calculation widget in it.

You can check this chapter of the user guide to learn more about setting calculations on your form by widget or by using conditions: https://www.jotform.com/help/chapter-9-Form+Calculations

If you have questions, please let us know.