When you add books and pages to a portal desktop (in a .portal file), you can determine the type of menus with which users navigate among those books and pages. The WebLogic Workshop Portal Extensions provide two types of navigation menus you can use:
Use the Multi Level Menu to enable drop-down menu navigation.
To create drop-down navigation menus
For Mobile Device Support: To support Multi Level Menus in mobile devices, delete the line display: none; in the book.css file in the skins that will be used for mobile devices.
To view examples of fully functional portals, see the Portal Samples. The Tutorial Portal shows different navigation menu implementations (Single Level Menu and Multi Level Menu).
Also, when you create a Portal Web Project, a predefined set of navigation menus is added to your project in the <project>\framework\markup\menu directory.