Greetings, @MM448.

Let me share some information on how you can edit multiple invoices at the same time.

Here's how:

1. Go to the New+ icon.
2. Choose Batch transactions.
3. In the Select transaction type ▼ drop-down, select Invoices.
4. In the Action ▼ drop-down, click Modify.
5. Select the check-boxes for the invoices you want to modify.
6. Click Edit from the Actions fly-out.

This feature is available only in the QuickBooks Online Advanced version. You can refer to this article for more detailed information: Edit multiple invoices at the same time in QuickBooks Online.

If you're using QuickBooks Online Plus, Essentials, and Simple Start, you'll have to open each invoice one-by-one and edit it.

Post your comments if you have other questions about managing your invoices in QuickBooks. I'm just a few clicks away.