The Custom Segments feature lets you create custom classification fields similar to class, department, and location.
After enabling the Custom Segments feature, you can create custom segments by going to Customization > Lists, Records, & Fields > Custom Segments > New.
By default, only administrators can create and configure segments and segment values. A custom segment can be applied to either a custom record type or one of the other record types on the ‘Application & Sourcing‘ subtab of a custom segment