Documentation
Configuration - Modules - CRM - Manage units
This section only applies if the module CRM is active.

When working with orders, you can specify units. Some examples are: times, months, hours, kilometers.
You can specify the units via Configuration > Modules > CRM > Manage units. A blank line appears after clicking '+Add new unit'. On the blank line, enter the description of the unit. There are two buttons with the 'A' icon to enter a description. The first is used for the plural description, and the second is used for the singular description.

The units appear on the dashboard of an order in the 'Order details' block. In the 'Order details' block, you can add an order line. When entering the data, you can specify the quantity along with the corresponding unit.