Yes, you can add multiple gift cards to your account.
Go to crave.ca and sign in to your account
Click on ‘Manage Account’ and then ‘Subscriptions’
Click ‘Edit Subscription’ then ‘Add a Gift Card’ under ‘Payment Info’ section
Enter your gift card code and PIN found on the back of your gift card or in the confirmation email you received with your electronic Crave gift card and then click 'Add'.
Repeat steps 3 and 4 for additional cards.