Similar GUI concept to navigating nested menus, adapted for a new purpose. ie: The top-level menu choice is AM or PM, then there are 12 sub-menus, and each has

Similar GUI concept to navigating nested menus, adapted for a new purpose. ie: The top-level menu choice is AM or PM, then there are 12 sub-menus, and each has identically named set of sub-sub-menus (00, 15, 30, 45). EDIT a difference is that it remembers the (sub-)submenu chosen when you change a higher-level menu.