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I've done a bit of digging and see that this topic is a few years old and Shopify has done nothing about it. Using promo codes to support gifting would be an excellent feature, and I appreciate the cart is finalised prior to this stage of the process; notwithstanding, it's a feature I really want to see. If anyone has a work around or knows any apps that can do this i.e. promo code for gift, let me know.
Shopify, despite their tremendous hard work, they have failed o solve this issue and that is where this app comes to rescue. If you want to get promo code done for your store, explore this option