In the WP menu creation GUI there’s the Automatically add top level pages option. I would like to do the opposite, for any page that is in the menu, automatically add it’s child pages. Is there a way to do that ?
How can I automatically add child pages to pages in a WP menu?
Simply put: no.
If you want dynamic updating of your menu items, you would probably be better-served using
wp_list_pages()orwp_page_menu().An alternative, at least, is to use this plugin: Auto Submenu