You can only delete values from enumerations that have a classification of Custom Field Picklists.
To delete an existing value from an enumeration:
- Navigate to the Enumerations page.
- In the Enumerations list, select an enumeration.
- Click the Values tab.
- Select the value you want to delete and click the Delete button .
- In the confirmation dialog that opens, click Delete.
The value is deleted from the enumeration.