register_post_type( 'custom_post_type_name', array(
'capability_type' => 'post',
'capabilities' => array(
'create_posts' => false, // Removes support for the "Add New" function ( use 'do_not_allow' instead of false for multisite set ups )
),
'map_meta_cap' => true, // Set to `false`, if users are not allowed to edit/delete existing posts
));