How can I restore a deleted invoice?

You can not, you have to recreate it.  Try the audit log to see what information is available to help you do that

I print the transactions from the audit log.  This invoice has payments against it & an open balance.  How do I recreate that?

Good morning, @liz-gdgroupnj-co. 

Thanks for reaching back out to the Community and adding some clarification on what you need assistance with. I can give you some information that will help you understand how to recreate this transaction to ensure your books will be correct in the end. 

It's simple and easy. All you need to do is recreate the invoice, and the payment will count as a credit. The credit should automatically apply to the new invoice. Here's how to create the new invoice: 

1. Go to the +New button in the left-hand menu bar. 

       2. Under the "Customers" column, pick Invoice. 

       3. Enter all the required details and hit Save and New or Save and Close. 

Afterward, I recommend signing out of your account and then back in so that your QuickBooks will load as a fresh new page. This will help to ensure that payment links with the invoice. 

If that doesn't work, no worries. Here's a guide that can help you manually link the information together to get you back on track. 

I hope these details helped answer your question. If you have any other concerns, don't hesitate to ask. I'm always here to lend a helping hand. Wishing you and your business continued success!