Reason code entry for discounts

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We are working to transition our stores over to Shopify as a POS platform. Currently, cashiers are required to enter a reason code when adding a discount code to the order being rung. Is there an app, or a setting I'm missing somewhere that will allow for a POS accessible entry field for a "reason code", or the like? Maybe a tag or some other metadata that can be associated with the discount applied, and later referenced in reporting along with the customer, and order.