Hey @crystalcouch, thanks for reaching out and welcome to the Seller Community 🙂
So I can better understand what you're trying to do, what sort of information do you want pre-filled in an invoice?
We do have the option to send recurring invoices, which will set the invoice to automatically send to the same customer for the same amount over a period of time set by you - does this help with what you're trying to do at all?
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