No, Copper does not allow that. Express Invoice (which is a paid product) does allow it though. I guess there are limitations with these free products.
- One thing I could suggest is to have your items prices set to its maximum price, and then at the time of entry, just apply discount with 'Adjust Discount' button. Lets say, a widget price is set to $100. But, if you want to sell it in $60, apply 40% discount to it. Discounts on receipts usually have positive effects on customers according to many studies, and businesses apply the strategy all the time.
- Another strategy would be to add multiple barcoded coupons into your Copper (e.g., $5, $10, $20) and ring a coupon barcode during the transaction entries. Again, limitation here is Copper only allows one coupon per transaction.