How to assign a post to a post parrent?

Posts & Pages are “built in” Custom Post Types. So something that was delivered as a pre-configuration when WP was installed. There’s also other built in stuff like Tags & Categories which are basically nothing other than custom taxonomies.

And you’re lucky: You can simply use the API and add your own, hierarchical custom “post” type.

register_post_type( 'hierarchical' => true );

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