Hi there, jsosner.
Allow me to share some details regarding the option to link bills to a customer in QuickBooks Online.
What @4Gal mentioned is correct. In QuickBooks Online Simple Start, the option to record or create bills isn't available. It is designed for simple businesses that don't need to enter and track bills for the vendor.
If you need more advanced features, such as linking customers to bills or tracking customer expenses more efficiently, you may want to consider upgrading to a higher edition of QuickBooks Online. See this article for more details: Upgrade or downgrade your QuickBooks Online subscription.
You can also check out this link to find out what reports are available for your QuickBooks Online version: Reports included in your QuickBooks Online subscription.
Leave a comment below if you have any further questions about using Simple Start. I'm always here to help you.