Use Set-ID-Enabled Lookup Types to Control Values in Lists
To enable different values in a drop-down list for a specific business unit (BU), you use the supplied set-ID-enabled lookup types for leads and opportunities.
Some lookup types are "set-enabled". Set-enabled artifacts let you associate them with a BU and with reference data sets. Reference data sets let objects share reference data across BUs. For example, you can choose to have opportunity Win/Loss Reason lookup type shared across BUs, or you can choose to have each BU manage its own. You can also assign a reference data set to reference data objects, such as sales methods.
Use the Manage Set Enabled Lookups task from the Setup and Maintenance work area to access the lookup types related to leads.