How to add values from multiple fields into another field

 how do you add multiple fields to calculate a sum

You can either use conditions — How-to-Insert-Text-or-Calculation-into-a-Field-Using-Conditional-Logic or the Form Calculation widget — How-to-Perform-Form-Calculation-Using-a-Widget to add the value of fields in your form.

I have created a clone version of your form and I see that you have used condition to add the value of the "Amount" fields in your form into the "Total Reimbursement".

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