Use the Item UOM module to create and edit a unit of measure (UOM). Items are described by UOMs and some can have integer or decimal values (for example Count allows only integers whereas Size allows for integers and decimals). Make sure to check the UOM Centre before creating a new UOM as a lot of these will be already set up for you in the system. However, if you want to add a few more you can do so so.
Please Note: You cannot delete a UOM if it exists in one or more database tables.
Video tutorial: