WHERE : BOM / Settings / Units of Measurement
Overview
When you add / edit an INVENTORY ITEM, MENU ITEM or MODIFIER you select their units of measurements (UOM) from the provided built-in list. By default, that list includes over twenty various units. As a rule, you use a limited set of UOMs that are determined by the scope of your business.
This topic helps you configure the built-in list of UOMs suitable for your business.
Setting Available Units of Measurements
In the left pane of Back Office Management console, expand the Settings node, and then click Units of Measurement.
This opens the built-in list of available UOMs similar to the following screen.

In the Enable column, you can turn on / turn off the units you want to be available.

In the Default column, click next to the unit you want to make the default UOM.