Thanks for joining in on this discussion, liz3.

Let me share the details about updating your invoices in QuickBooks Online (QBO).

When you edit an invoice, your customers won't notice any changes. However, you can notify them about the updated one when you email the invoice again. 

When sending an updated invoice, you'll be prompted with this message:

Moreover, you'll have to record the payments in QBO if your customer pays an invoice. This way, it ensures your accounts are balanced and accurate. 

Keep in touch if you have further clarifications about managing your invoices. We're always here to assist you further. Keep safe!