Add Post type menu to another menu

2 comments

1. You only need to add the page slug to “show_in_menu”, making the answer to your example:

   'show_in_menu' => 'mytestpage',
   

   For a more complete example:

   Admin/Settings page of: /wp-admin/admin.php?page=mytestpage

   register_post_type('mycpt', array('label' => 'My Custom Post Type', 'capability_type' => 'post', 'show_ui' => true, 'show_in_menu' => 'mytestpage'));
   

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2. Ended up creating the custom post type and adding my custom page as sub page to that, as suggested by Bainternet

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