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Here's how you can memorize an existing invoice:
Feel free to browse this article for more information: How to Create a Recurring Invoice and Manage Recurring Transactions.
Meanwhile there are different ways to pull up the previous invoice. You can use the Search option (magnifying glass icon) at the top menu to see the Recent Transactions.
If you're in the Invoice window, you can click the counter-clockwise clock icon in the upper-left corner (beside Invoice #).
Here's another way to pull up previous invoice:
Let me know if you need anything else.