Saving down the sum of two input values in a Repeating Group

I have a repeating group where each item has two values - these two values are what you see in the input fields of each of the rows in the image below.

The value beneath the two input fields is the summed value of the inputs (EG $1,000 + $2,000 = 3000). This value will change if the user edits the two input values.

I want to save the sum of the two input values down to my database, but ONLY when a user clicks a save button. This rules out using the “when an input’s value is changed” to directly change a value in the database.

How do I do this?

I cannot reference the input values in a repeating group when creating a workflow action.

Any advice would be MUCH appreciated :slight_smile:

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