Hello there, jenny46.

I'm here to ensure you can restore a deposit that's made against a job in your QuickBooks Desktop account. This way, you'll be able update and manage your billable transactions. 

Deposits and invoices are two different transactions. Ideally, when you accidentally deleted the invoice, the deposit should remain in your account. Since the deposit isn't showing as billable expense that you can add to your new invoice, you can pull up the Audit Trail report to check its details. Then, make it billable again.

1. Go to Reports menu.
2. Select Accountant & Taxes.
3. Choose Audit Trail.
4. Click the Customize Report button.
5. Go to the Filters tab.
6. In the Search Filters field, type in Transaction and select Transaction Type below.
7. Select Deposit from the Transaction Type field.
8. Click OK.

I've attached a screenshot below that shows the fourth to eighth steps.

Once done, you can now link the deposit to the new invoice you created.

Additionally, with QuickBooks Desktop's job costing tools, you'll be able to see how much money you spend and make for each job. To accurately record your job cost, you can refer to this article for the compete details: Tracking job costs in QuickBooks Desktop.

Please let me know if you have other concerns. I'm just around to help.