Glad to have you connect with us here. QuickBooks is a powerful program that enables you to get your work done faster. I can see the benefit of being able to add a memo field to the invoice.
Based on what you've described, I encourage you to explore more about using Custom fields using this link here. Feel free to browse through the article. You can use the custom fields similarly to how you'd use the memo field you're looking for. It's also important to note that this feature isn't available on the EasyStart subscription package.
Let me know if this info helps by leaving a comment below. I'll be on standby in case you need anything else.
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