When you delete a category class that is referenced by some categories, you must reassign the categories to another category class.
To delete category classes:
Navigate to Administration > Content Intelligence > Category Classes.
Select the category classes you want to delete.
From the File menu, select Delete.
For category classes that are referenced by categories, select another category class for the categories from the Update categories to use the category class drop-down list.
Click OK to delete the category class.
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