When setting up items you can now specify various units of measure and receive and/or sell by different units of measure. For example, you may receive and stock items by the case, but sell them by the case, by the box or by each.
Another example of this is you might sell a beverage as a single, 6 pack and 12 pack. In this case you would have quantity unit variations of 6 and 12.
You can even attach an item number to a specific variation so it can be scanned easily. In addition to this you can define cost price, unit price, and promo prices for each variation as well as Inventory quantity, Reorder Levels, and Replenish Amounts.
Different units of measure can even have different bar codes associated with them. To add Quantity Units for any item, click the Variation tab and add the additional quantity units that you want to define.
On the sales screen and receiving screen you can change the unit of measure being sold/received: