Add-on: Sell Unit Items.
A unit says how you measure an item. It might be a foot, liter, or hour. Use Sell Unit Items for these sales.

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Sell by length, volume, time, or another unit.
Add-on: Sell Unit Items.
A unit says how you measure an item. It might be a foot, liter, or hour. Use Sell Unit Items for these sales.
Use Per item for items sold one at a time. Use Unlimited only when you do not need to track a stock count.