Can I add the gift card codes into my BookMyShow account?

Your wish is our command. Make sure you're signed in to BookMyShow, all you need to do is click on "Accounts & Settings" under "Profile", further to that click on "Saved Payment Methods" under mobile app/website.

Click on Add >> Select Gift Voucher >> Enter >> Save  

This is the best and safest way to save the voucher we don't want to lose something so important isn't it.