How to total and view calculated value fields on the form before submission?

How can I create a field on my form that displays the result total for the calculated fields?

You could assign calculation values to the questions in your form, and then get the total for all those answered ones, this guide will help you to assign a calculation value: https://www.jotform.com/help/301-How-to-Assign-Calculation-Value 

And this guide will help you to perform calculation on your form: https://www.jotform.com/help/259-How-to-Perform-Form-Calculation-Using-a-Widget 

You may also provide us more details about what you're trying to achieve, for example, if you're trying to get a score based on your answers, you could also share us the link to the form you're working on, we will be glad to take a look. 

Example:

1. Question number 1?

a. Answer "a" is worth 2 points

b. Answer "b" is worth 3 points

c. Answer "c" is worth 4 points

2. Question number 2?

a. Answer "a" is worth 2 points

b. Answer "b" is worth 3 points

c. Answer "c" is worth 4 points

I would like a field to show the combined total points of the answers.

For instance, if the the surveyor chose answer "b" for question 1 and answer "c" for question 2, total points would be 7.

Thank you.

Yes, following the guides I provided above will help you to achieve exactly  what you want, I've also created a form based on your example, here's the link where you can see how it works: https://form.jotformpro.com/70894209251963 

On the guides shared above you will find how to set a value to the field options and how to get the total calculated as  well. 

You may also clone my form and inspect what I did there: https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL 

If you have any question, let us know.