Hi there, darrensplinters.
I'd suggest pulling up the Invoice list report and customize the date range. This way, you're able to print last year's invoices or any dates you want to view.
For additional information about customising and printing reports, you can click this article: Run reports in QuickBooks Online. This also provides details on how you can email and export reports.
Please refer to this article to see steps on how you can personalise your sales forms and add information about your business: Customise invoices, estimates, and sales receipts in QuickBooks Online.
Let me know if there's anything else I can help you with QuickBooks. I'm always around here in the Intuit Community to help you out.