I believe that this plugin will do what you want.
Jamocreations Auto Submenu https://wordpress.org/plugins/auto-submenu/
Here is also a link to the author’s site, http://jamocreations.com/en/artikelen/auto-submenu , where he discusses why he built the plugin and also two other plugins that also work similarly. The advantage of the Jamocreations Auto Submenu plugin though is that if later you want to edit the menu using WordPress Menu editor the entries are actually visible there so you can reorder them or whatever.
The plugin works based on selecting a parent page from the WordPress page editor. If the parent page or parent sub-page has been added to the WordPress menu, then its child pages will automatically be added as well.
Related Posts:
- How to retrieve parent menu item name of current submenu item
- How to highlight 1st level menu item based on actual page
- How to sort a sub-menu, generated with get_pages(), by the page order instead of alphabetically?
- How to make pages metabox display all hierarchy in menu admin?
- wp_list_pages: only show subpages on the parent page?
- Does loading of sub pages in menu cause load to the server?
- Programmatically add existing pages and subpages to Appearance Menu
- get_the_title() gets printed out twice
- Add (grand)child pages automatically to nav menu
- Get parents child pages
- Dynamic menu wp_list_pages displaying only current branch including: current page, his siblings and its childs
- Parent Page > Child Page Menu
- Add CSS Class to WordPress Menu Item Dependent on the Page the User is Visiting
- Creating navigation out of specific IDs and their children?
- how to create pages and link them to a menu
- Display a portion/ branch of the menu tree using wp_nav_menu()
- wp_nav_menu: show menu only if one exists, otherwise show nothing
- Add custom menu item using wp_nav_menu_items filter
- how to create a menu with all sub categories?
- Add separator to admin submenu
- Display only page specific sub menu items using Custom Walker
- Add child pages automatically to nav menu
- Automatically remove trashed pages from nav menu
- Add a .last class to the last in each ul.sub-menu
- Multi Level Bootstrap Navigation Menu in WordPress
- Add class to top level menu item if it has multiple child levels
- How show sub menu only using wp_nav_menu()
- Keeping parent menu items active in child pages
- Show only 2nd level of navigation depending on active navigation
- Simple Navigation Walker – Wrapper-class around first sub-menu
- How to get a separate child menu?
- Exclude one item from wp_list_pages( $args );
- Directing a page to a default subpage
- wp_nav_menu() loses ‘current-menu-*’ classes on single product page within category
- How to drag multiple menu items at once in WordPress?
- Customizing the a tag with Semantic UI
- Can you have different menus and theme on a per-page basis?
- List children of second level sub page
- Put a wp_nav_menu inside another one
- Add items to a menu dynamically
- How to get current page menu item name instead of full menu item list
- Generate a Menu that displays all child pages of top level parent
- Hide pages depending on role
- Get parent page/menu id of current post
- How can I add a sub menu to an existing navigation menu in WordPress?
- Custom Nav Walker sub-menu HTML construct
- Check if wp_nav_menu items have submenus
- Add div to specific sub-menu
- Automatically Add New Tags to Sub-menu
- Change menu items URL
- Adding different classes to anchor in navigation menu
- Nav walker, bootstrap: Display 3rd level items under 2nd level
- how to only add a top-level admin menu without it creating a sub-level-menu
- how to automatically generate hierarchical menus from hierarchy of pages?
- Custom Walker for Walker_Nav_Menu
- Arrow down in menu not displaying
- Making WordPress’ page and menus visible only for logged in users, checking session variables
- Programmatically adding menu items function replicates in multiple menus
- Handling complex multi-level architecture / menu for large site
- Different side menu on each page
- Sub-Pages only of menu items in current branch using a custom menu
- WordPress – site with 2 stylesheets and more…
- Update Nav Menu Items Programmatically
- Remove Page Name From WordPress Menu
- Hiding Menu From Specific Pages
- How to display dynamic content in start_lvl function
- Getting post content within wp_nav_walker
- wp_list_pages sort order is different for different languages [closed]
- How to target children of child pages
- list pages only from master parent
- Menus like a CMS
- How to have custom menu Item CSS Classes for wp_page_menu() or wp_list_pages()
- next_post_link() on custom menu structure
- WordPress sub-menu items suddenly not showing
- How to add a submenu toggle button inside all “li” elements that have a submenu?
- No “current-menu-ancestor” class added when browsing an archive page
- Main Menu and Sub Menu Items for Footer
- How to construct a custom html for submenus
- Auto add pages to primary menu with functions.php
- Check if menu id = $specific_id – then insert specific
- Show menu based on parent & ancestor
- WordPress menu permalink redirects to wrong page
- How to include a third level with wp_get_nav_menu_items function
- wp_nav_menu() with multiple Class
- Link to Homepage in Menu
- How do you manage large menu hierarchies in WP?
- Add class active to static menu
- Update body class based on menu
- wp_list_pages() but only show children on the branch you are on
- add_submenu_page function to show videos table
- Trying to Create Menu in WordPress
- How do I add recent posts to the menu?
- How to add ID attribute to each submenu?
- Check if Page Already Exists in Menu
- Hierarchical menu nesting problem with jQuery targetting
- From a page, is it possible to find entry’s “menu_item_parent”?
- Automatically list top level menu item child pages
- Highlight current post ancestor parent menu items
- two different separate sections on the same site
- When clicking on menu item not going to specific page