Note: The steps below are for creating a new related unit of measure for an existing unit of measure set. You can also create an entirely new unit of measure set.
To do this task
Go to the Lists menu and click U/M Set List.
Double-click the set you want to add the unit of measure to.
Click a blank line in the Related Units table.
Enter the unit's name, abbreviation, and the number of base units it contains.
You can quickly create a new unit of measure while adding an item to a transaction form, like an invoice.
After adding the item, click the drop-down arrow in the U/M column and click .