//link the product to the category
        $cats = explode ( '|', $data[3] );
        foreach ($cats as $cat){
            $cat_taxs = explode( '->', $cat );
            $parent = false;
            foreach ( $cat_taxs as $cat_tax)
            {
                $new_cat = term_exists( $cat_tax, 'product_cat' );
                if ( ! is_array( $new_cat ) ) {
                    $new_cat = wp_insert_term(  $cat_tax, 'product_cat', array( 'slug' => $cat_tax, 'parent'=> $parent) );
                }
                $x = wp_set_object_terms( $post_id, (int)$new_cat['term_id'], 'product_cat', true );
                $parent = $new_cat['term_id'];

                //check out http://wordpress.stackexchange.com/questions/24498/wp-insert-term-parent-child-problem
                delete_option("product_cat_children");
            }
            unset($parent);
        }