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.