How do i add paid invoices to my page for my bas ?

Thanks for checking in here with us in the QuickBooks Community, mcdoogledutch.

Let me guide you on how you can upload your invoices here in QuickBooks Online. Here's how to:

1. Click on the Settings icon from your QBO account.
2. Click on the Import Data.
3. Choose Invoices.
4. Select Browse and then find your CSV or Excel file for the invoices you wanted to add in QBO.
5. Click on Next.
6. Map your columns with the invoice fields in QBO like date, GST and other mandatory fields.
7. Once done click on OK and click on Done.

Then, check your invoices in your Sales tab menu. For reference you can check this link to learn more about: Importing multiple invoices at once in QuickBooks Online. 

Feel free to reply to this post if you have other questions about invoices.