Add an item as a child to the selected item. to add a main menu item, select "Navigation Bar" and then click Add button. To create sub-menu item, select any main menu item you want to add sub-menu item and then click Add button. Sub-menu items are optional. It is not necessary to add them. To create sub-menu item under another sub-menu item, select the sub-menu item you want to add another sub-menu item and then click Add button. There is no limit on the levels of sub-menu. However, the sub-menu will not be opened on the right if it reaches the right edge of the page. So, you may need to keep sub-menu levels low for the items on the right.
