Can I create a code that will 100% comp an item based on my COST, not the price it sells for?

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In our wine shop we frequently open bottles for tastings. We need to track the bottles that are being opened (and not sold) so I'd like to create a code we can enter that will 100% "comp" the bottle in the system, but it needs to reflect our COST, not the price we are selling the bottle for.

The only code I've been able to create so far is a 100% "Discount", but the system bases that on the sale price entered in the POS system, not our actual cost, resulting in incorrectly inflated "discounts". Has anyone else encountered this?