To create a new Category List Menu Item:
To edit an existing Category List Menu Item, click its Title in Menu Manager: Menu Items.
Used to show a list of contact categories within a category.
For more information please see http://docs.joomla.org/Help30:Menus_Menu_Item_Manager_Edit#Details
See Menu Item Manager: New Menu Item for help on fields common to all Menu Item types, including Details, Link Type Options, Page Display Options, Metadata Options, and Module Assignments for this Menu Item.
See Contact Category: Category Options for help on this field