How can you match historic invoices when payments have been categorised to sales and reconciled ?

You're on the right path, CEH13. I'm here to help you manage your invoices.

Since you've already categorized and reconciled your account, the option to match invoices is unavailable. As a workaround, undo the reconciliation first and it will allow you to do so. I highly suggest working on this with an accountant.

Accountants can undo an entire reconciliation to help you start over from the beginning. If you haven't added one yet, you can add an accountant.

Here's how:

1. Go to the Gear icon in the upper-right corner.
2. Click Manage Users under Your Company.
3. Select the Accounting firms tab, and click the Invite button.
4. Enter the accountant's email. Then, click the Invite button.
5. Click Save.

Also, you can edit individual transactions if you prefer to do it yourself. When done, proceed to match transactions you then reconcile.

Finally, you can navigate these articles to learn about reconciliation reports and workflow in QBO:

• Reconciling workflow 
• View, print, or export a reconciliation report

Please let us know in the comments if you have further questions about matching invoices in QBO. We're always here to help you out.