In STEL Order you can store multiple customer addresses, e.g. one for billing, one for shipping, one for delivery, etc.
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Within the customer, you have to click on Edit and in the Other addressestab, you can register the addresses your customer has. These addresses you add, you can use them in the sales and SAT documents, to indicate shipping/work addresses as well as the different billing addresses you add, which you can indicate in any document.