I have been able to add menu items with this statement, this however creates a flat menu. The menu has been created already. I just need to add items.
wp_update_nav_menu_item(4, 0, array('menu-item-title' = __($post_title), 'menu-item-url' = home_url('/'.$url.'/'), 'menu-item-status' = 'publish'));
this is super simple to use. How do I add a sub-menu item?
I have found what I was looking for the function returns an id of the menu item needed.
$my_menu_id = wp_update_nav_menu_item(4, 0, array('menu-item-title' => __($my_menu_title), 'menu-item-url' => home_url('/'.$url.'/'), 'menu-item-parent-id' => $my_menu_id, 'menu-item-status' => 'publish'));
by knowing the menu id you can then create sub menus attached to the first menu item using the menu-item-parent-id
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