Модуль flex. Считать от субтотал, как? - [VM1] Модификации и хаки

global $weight_total, $total, $tax_total, $order_tax_details, $discount_factor, $order_total;

global $weight_total, $total, $tax_total, $order_tax_details, $discount_factor, $order_total, $subtotal;

global $total, $tax_total, $CURRENCY_DISPLAY;

global $total, $tax_total, $CURRENCY_DISPLAY, $subtotal;

        else {
            $taxrate = $this->get_tax_rate() + 1;
            $order_total = $total;
        }

        else {
            $taxrate = $this->get_tax_rate() + 1;
            $order_total = $subtotal;
        }