Hello there, @stephen-panasl-c. I'm here to provide information about adding supplier invoices to QuickBooks Online (QBO). 

I appreciate you sharing details about your concern. Thanks also for providing a list of situations that needs to be entered correctly to align with your country's accounting rules. 

In QBO, a supplier's invoice (bill) is only available in the Essentials, Plus, and Advanced versions of QBO. To use this feature, you might want to consider upgrading your subscription. Once done, you can now refer to the steps outlined by my colleague, Rose-A in recording your A/P transactions. 

For reference, feel free to check this article: Track bills and record the payments.

I'd love to know how this goes. I'm just a post away to lend a hand if you have additional concerns about adding supplier invoices in the program. Don't hesitate to leave a comment below and I'll get back to you as soon as possible. Have a great week ahead and take care.