If the list of dates is a RG of sales, then make the RG data source filtered by date (which I assume you already have set up, if irrelevant dates are hidden on date selection) and make the total field = RG sales, list of sales, each item’s value SUM.

If you actually have individual input fields and are hiding them using conditionals I don’t see how this can be done without a condition for each date, which unpractical.

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