To actually get the new menu to show on the site, you have to create a menu module. The module is the functionality block that contains your menu and that's needed to be able to display menu contents. Let's tell Joomla where you want it to show:
Go to Menus | Menu Manager to see all menus. Locate the About CORBA menu. Click on the Add a module for this menu type link, found in the Modules linked to the Menu column. (Actually this is a shortcut to the Module Manager—it saves you a few clicks navigating to to Extensions | Module Manager, clicking New and selecting Menu.)
In the Module Manager: Module Menu screen, enter a title for the About CORBA menu. Select Position: Right [position-7]. This will make the new menu appear in the same column as the Main Menu.
Click on Save and click on View site. There you are! A separate menu appears. The new About CORBA menu is displayed in the right-hand side column:
You're almost there! We've got our...