It's easy to combine orders you placed at Amazon.ca, provided the order has yet to enter the shipping process. Click the Your Account link at the top of any page. Next, click the "Combine orders" link. Once you've signed in, you'll see a list of your open orders. Click the box to the left of each order you'd like to combine. When you're finished, click the Combine Orders button.
If the orders you're combining have different shipping or payment options, we'll ask you to confirm the options of the new order.Orders That Can't Be Combined
You may combine any orders, with the following exceptions:
Please, bear in mind also that items shown as able to be shipped within 24 hours can enter the shipping process immediately after you place your order, and it might not be possible to combine such items with existing orders.