You can create multi-level menus so that options appear grouped under other options. You can create as many levels of menu options as you wish, though older themes may not proper display more than 3 menu levels.
To create a multi-level menu, click the Reorder pages link on the Site pages screen. Next, drag the page you want to be a submenu option to the right of the page you want to act as the parent menu option.
Once a triangle appears to the left of the parent page name, you can release your mouse button. After you drop the page, it will appear grouped under the parent menu option, both within the page list and in your site menu.
You can click the minus sign beside the parent page to collapse the list of subpages, and click the plus sign to expand it.
You can also group a page under another page through its page settings. Under Position in menu, click the Child of selected page option and select the page you want to group it under.
Note: Within multi-level menus, a top-level menu option is still clickable and links to a separate page. For instructions on making top-level menu options not clickable, click here.