Let me help with your bills, lisa103.
The ability to create or manage bills is currently offered in the Essentials, Plus, and Advanced versions of QBO. If you're using any of these plans, make sure that you're log in to the correct account to use the feature.
If you have the Simple Start plan, you can proceed and upgrade your account to be able to create bills. Follow the steps in these articles on how to do it: Upgrade your QuickBooks Online subscription.
Here's a comparison chart for all versions of QuickBooks Online and the list of features that they offer: https://quickbooks.intuit.com/pricing/.
You can also use this guide for creating bills for additional reference: Enter and pay bills.
Feel free to reply or reach out to us again if you have other questions in mind. It'll be a pleasure to help you again.