You may need to create a product item that has multiple ways in which its unique item ID/unit of measure combination can be packaged. In this case you can create alternate ordering units of measure that can be used in the selling environment.
For example, you may create a unique item ID/unit of measure combination for a 6-Pack of Pens. However, in your selling environment you sell this item one of three ways: individually, cases, and pallets. In this scenario you can create three alternate units of measure that can be associated with the 6-Pack inventory unit of measure: 6-Pack, Case, and Pallet.
To add an alternate unit of measure: