Discount a Custom Line Item in the POS
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When checking out using the POS, you can add Custom Line Items to the order.  This is useful when adding a charge for an item that is not currently in the system’s inventory.
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If you wish to add a discount to a Custom Line Item in the POS, it is actually far better to add the post-discounted price to the line item upon entry.  This will cause far less confusion and difficulty.  For example: Someone wants a soda that costs $1.00 which is discounted $0.25 due to a dent.  You would simply enter the Custom Line Item as $0.75.
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For a full walkthrough of how to add and process a Custom Line Item, please review this link: http://help.crystalcommerce.com/faqs-and-troubleshooting/checking-out-on-the-pos
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