I'm working on the WordPress where I have multiple custom post type, but I want to know How we can create menu and use as a add-submenu-page for admin menu?
I want to create add menus from Appearance > Menu and create submenu to an admin menu
register_nav_menus(array(
'top-content' => 'Top Content',
'header-menu' => 'Header Menu',
'adminsub-menu' => 'Admin Sub Menu',
));