rapuolas

Thank you for your respond.

I am trying to do as you said.
For now i got taxonomies.

Found a code that should do the half of the job, but can not get the index, could you help me with this?

   add_action( 'wp_footer', 'getOrderID' );

   function getOrderID() {

      $custom_terms = get_terms('ait-items');
      foreach($custom_terms as $custom_term) {
       // var_dump($custom_term);

        wp_reset_query();
        $args = array('post_type' => 'ait-item',
          'tax_query' => array(
            array(
               'taxonomy' => 'ait-items',
               'field' => 'slug',
               'terms' => $custom_term->slug,
               ),
            ),
          );

        $loop = new WP_Query($args);

        if($loop->have_posts()) {
         echo '<h2>'.$custom_term->id.'</h2>';

         while($loop->have_posts()) : $loop->the_post();
         echo '<a href="'.get_permalink().'">'.get_the_title().'</a>';
         endwhile;
      }
   }