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