An attribute is composed of an attribute class, attribute name, and attribute value. When an attribute name is deleted, it is removed from the client interface. To delete an attribute name, delete all values associated with the name.
To delete an attribute name
On the Setup tab, click Enumerated Values Manager.
From the Attribute class list, select the class to delete the attribute name from.
From the Attribute name list, select the name to delete.
For each value in the list, select the value and click Delete.
Administration Tools: Enumerated Values Manager > View operation