Perform calculation between 2 options of Gift Registry Widget

my other question is how do you calculate two results when they are inside one entity - for example, how do you add together two gifts or take away the value of two gifts?

for example

Ticket price mins - FIRE KING + GONG FARMER

I need to run further tests and will get back to you latter.

Let us know if we can assist you.

Unfortunately I could not find a solution that would work with Gift Registry widget. It seems that this widget does not interact normally with form calculation fields.

When we select more than one option it invalidates the calculation.

You can test the demo form:

http://form.jotformpro.com/form/42733948080964? 

Bellow I will explain the process just as an idea, but unfortunately it does not work.

I can forward a feature request to our developers so they can consider a change in the interaction of form Calculation with update value condition.
Let us know if you want us to proceed.

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I added several Form calculation fields to each of the options and one for the sum of them:

Then you can create conditions to update fields with a value, according to the selection:

On the Total field you need to add a formula that sums all the options' calculation fields: