How do I change the customer’s name on an invoice that’s already billed?
To change your customer’s name for an invoice:
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Go to the Invoices module on the left sidebar and click the invoice for which you want to change the customer’s name.
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Click the customer’s name on the invoice template. You will be taken to the customer’s Overview page.
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Click Edit on the top right corner of the page.
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Edit the Customer Display Name field.
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Click Save.
Now, the customer’s name will be updated in all the invoices, including those that are already billed, and in all other transactions as well.