Hide parent link in submenu on admin menu

As @Tom J Nowell pointed out in the comments, using the same slug for the admin menu and the first submenu has the effect of removing the repeated menu name in the submenu.

function newintranet_tabs_admin_menu_option() {
    add_menu_page('CMC Intranet Tabs', 'CMC Intranet Tabs', 'manage_options', 'newintranet_tabs_admin_menu', 'newintranet_tabs_scripts_page', '', 200);
    add_submenu_page('newintranet_tabs_admin_menu', 'Add Tabbed Page', 'Add Tabbed Page', 'manage_options', 'newintranet_tabs_admin_menu', 'newintranet_add_tabbed_page_page');
    add_submenu_page('newintranet_tabs_admin_menu', 'Edit Tabbed Page', 'Edit Tabbed Page', 'manage_options', 'newintranet_edit_tabbed_page', 'newintranet_edit_tabbed_page_page');
    add_submenu_page('newintranet_tabs_admin_menu', 'Order Tabbed Pages', 'Order Tabbed Pages', 'manage_options', 'newintranet_order_tabbed_page', 'newintranet_order_tabbed_page_page');
    add_submenu_page('newintranet_tabs_admin_menu', 'Delete Tabbed Page', 'Delete Tabbed Page', 'manage_options', 'newintranet_delete_tabbed_page', 'newintranet_delete_tabbed_page_page');
}
add_action('admin_menu', 'newintranet_tabs_admin_menu_option');

Note that the 1st submenu’s slug has been changed from newintranet_add_tabbed_page to newintranet_tabs_admin_menu.

Screenshot of my local site with the above code in use

I assume this is what you’re looking for (ignore the colour scheme, that’s just my local dev server).

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