Yes, you can! Upon checkout, simply enter your gift card number where it says "Redeem Gift Card" and click APPLY. Once applied to your order, you will be able to enter the next gift card number and apply it the same way:
If you would like to remove a gift card, simply click REMOVE on the left hand side.
To confirm all gift cards were added to your order, you will also see them reflected in your order subtotal as well as the remaining balance due: