How to load catalog model in admin controller
<p>I am using Opencart Version 2.1.0.1, how to load frontend model in admin controller,</p>

<p>i have a model function which tells external booking id </p>

<pre><code>class ModelShippingParcelled extends Model {
        public function getParcelledBooking($order_id) {
             $query = $this-&gt;db-&gt;query("SELECT booking_id FROM " . DB_PREFIX . "parcelled WHERE order_id = '" . (int)$order_id . "'");
             return $query-&gt;row;
    }
</code></pre>

<p>I want to load this model in admin controller. What is the best way to do this?
Should I rewrite this model in admin too? But I don't want to rewrite the same function. If there is a good way please suggest!</p>