tradematik register custom post type

add_action( 'add_meta_boxes', 'portfolio_product_box_add' );

function portfolio_product_box_add() {
$meta_box_tradematik=get_meta_box();

add_meta_box($meta_box_tradematik['id'], $meta_box_tradematik['title'], 'tradematik_product_box', 'portfolio', $meta_box_tradematik['context'], $meta_box_tradematik['priority']);
}