I added the below Liquid Code to add a custom text box to a product but would like the content the customer puts in the text box to show up on the order and in the cart when they check out:
Then, edit the previous code as below. If you want to display on any product, you can add product.id == (your product id) in the {% if %} tag. If you want to display it on multiple products, then add “or” between product ids (in the picture, I’m showing this box on 2 products)