Custom Post type inside custom post type

function job_applicants(){
	$labels = array(
	'view_item'           => __( 'View Applicant', 'text_domain' ),
        'add_new_item'        => __( 'Add New Applicant', 'text_domain' ),
        'add_new'             => __( 'Add New Applicant', 'text_domain' ),
        'edit_item'           => __( 'Edit Applicant', 'text_domain' ),
        'update_item'         => __( 'Update Applicant', 'text_domain' ),
        'search_items'        => __( 'Search Applicant', 'text_domain' ),
        'not_found'           => __( 'Not found', 'text_domain' ),
        'not_found_in_trash'  => __( 'Not found in Trash', 'text_domain' ),
	);

	$args_applicants = array(
	    'label'               => 'Job Applicants',
	    'labels'              => $labels,
	    'description'         => sprintf(esc_html__('List of %s with their resume.')),
	    'public'              => FALSE,
	    'exclude_from_search' => FALSE,
	    'publicly_queryable'  => FALSE,
	    'show_ui'             => TRUE,
	    'show_in_menu'        => 'edit.php?post_type=jobboard',
	    'show_in_nav_menus'   => FALSE,
	    'menu_icon' 	  => 'dashicons-clipboard',	    
	    'supports'            => array('title', 'editor', 'author', 'thumbnail', 'custom-fields', 'comments', 'revisions'),
	    'can_export'          => TRUE,
            'has_archive'         => TRUE,
            'exclude_from_search' => FALSE,
            'publicly_queryable'  => TRUE,
            'capability_type'     => 'page',
	    'capabilities'        => array(
	           'create_posts' => TRUE,
	    ),
	    'map_meta_cap'        => TRUE,
	    'hierarchical'        => FALSE,
	);
	register_post_type("jobboard_applicants", $args_applicants);
}
add_action( 'init', 'job_applicants', 0 );