Store Charge (Packing/Extra) , so the Total Store Charge (Packing/Extra) in the cart = number of items in the cart * store charge.
For now , we can only have option to change the Store charge (Packing/Extra) to be dynamic : by changing calculation of Store charge (Packing/Extra) in the OrderController.php
In the OrderController.php file , i added this code. 
            $resCharge = 0;
            foreach ($request['order'] as $oI) {
                $originalItem = Item::where('id', $oI['id'])->first();
                $resCharge += ($restaurant->restaurant_charges * $oI['quantity']);
                if (isset($oI['selectedaddons'])) {
                    foreach ($oI['selectedaddons'] as $selectedaddon) {
                        $addon = Addon::where('id', $selectedaddon['addon_id'])->first();
                        if ($addon) {
                            $resCharge += $restaurant->restaurant_charges * $oI['quantity'];
                        }
                    }
                }
            }
            $newOrder->restaurant_charge = $resCharge;
What do u think @Bobelism @[deleted]  @VoyagerMarketing  @Kara ?