Displaying menus for navigation fields
Horizontal and vertical navigation fields enable users to navigate to screens quickly and easily. A horizontal navigation field might enable users to move from application to application, and a vertical navigation field might give users access to common functions and application entry points within an application.
Navigation fields can act as anchors for other menu fields, and you can use multiple navigation fields with menus attached to them. Horizontal navigation fields can have only one level in their structure. Vertical navigation fields can have unlimited levels.