Do it as a discount, and name the discount for the used equipment you took as an exchange.
Topic summary
Managing part exchanges (trade-ins) in a POS app for a guitar store and issuing a receipt.
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Proposed approach: Record the customer’s used guitar value as a discount on the new guitar sale.
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Implementation detail: Name the discount to reflect the exchanged item (e.g., “Trade-in: Used Stratocaster”) so it appears clearly on the receipt.
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Effects: The discount reduces the sale price and provides a documented line item for the trade-in on the receipt.
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Considerations: This method may not track the used guitar as inventory or capture its valuation separately; additional steps outside the POS discount might be needed for inventory intake and accounting.
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Status: One suggested solution offered; no confirmation or alternative methods provided. Discussion appears open.