How to add gift wrapping?

From your Shopify admin, Go to Products > All products > Click Add product.

Create a gift-wrap product just as you would create any other product

You can use your product description to explain what materials will be used to gift-wrap the items.
Give your gift-wrap product the price that you want to charge for the service. If you want gift wrapping to be free, then set the price of your gift-wrap product to be 0. You can upload an image for the product to show your customers what a gift-wrapped order will look like.

Make sure your gift-wrap product includes inventory, or else adjust the settings so that Shopify doesn’t track inventory for the gift-wrap product. If your store has multiple locations, then uncheck Track quantity to prevent Shopify from tracking inventory for the gift-wrap product.

Enable Gift Wrapping Option from Cart Page Section.

Select gift wrapping product in section

You can change message. Use “$” sign where need to display price.

Save page.