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