
Paste the following code into your theme’s functions file.
add_filter( 'register_post_type_args', 'customize_service_post_type_labels', 10, 2 );
function customize_service_post_type_labels( $args, $post_type ) {
// Let's make sure that we're customizing the post type we really need
if ( $post_type !== 'destinations' ) {
return $args;
}
// Add new arguments
$args['hierarchical'] = true;
$args['supports'] = array( 'title', 'editor', 'page-attributes' );
return $args;
}