Install Submenu from the Upgrade Store
More information about the Upgrade Store can be found here.
Implementing a Submenu on a specific main page
A submenu can only be added to a page without any other content. When the page is completely empty, the submenu will be available in the element overview.
Drag the component onto the page or double click on it to install the submenu feature.
Adding and deleting pages in the submenu
The submenu works in the exact same way as the common Page Management. Take a look at our article about Page Management to learn more about it.