Hello - I have recently run into a situation where I need to be able to add a different billing address after the order has already been entered. I know how to change a billing address if it exists already in the order, but when there is no separate billing address at the time the order is completed, I can't figure out how to then ADD a billing address in the Shopify backend. When I pull up the order, I can see where it says that the billing address is the same as the shipping address, but I can't figure out how to change that so that I can enter a separate billing address. Perhaps (I hope) I am missing something very basic? Thank you in advance.
having the same issue. The lack of answer to your question makes me wonder if it is not possible to do it, which I cannot understand since it is a common mistake when a B2B business buys (they ask afterwards for billing).