wordpress: how to add hierarchy to posts

Question

I am creating a web-site on wordpress platform where I want to be able to post my own book texts. So what I want is to have a some kind of hierarchy where I would add a post

Answer 1

Isn't this a better option?

register_post_type( 'MYPOSTTYPE',
    array(
        'labels' => array(
            'name' => __( 'MYPOSTTYPE' ),
            'singular_name' => __( 'MYPOSTTYPE' )
        ),
        'supports' => array('title', 'editor', 'page-attributes'),
        'public' => true,
        'has_archive' => true,
        'hierarchical' => true,
        'rewrite' => array('slug' => 'MYPOSTTYPE'),
    )
);

I have added:

'hierarchical' => true,

and it works.