You're welcome, @paul32. It's our pleasure to help.
You can add those invoices by importing them. You'll just need to add all the information in a spreadsheet. Here are the required columns:
- Invoice number
- Customer
- Invoice date
- Due date
- Item amount
- Item tax code
Then, go to your Account and Settings to turn on Custom transaction numbers. From here, you can now upload your spreadsheet.
See this article for detailed guidance: Import multiple invoices at once.
Let me know if there's anything that I can help. I'm always here to assist.
