Can I convert a supplier credit note to a bill?

Welcome to the Community, useraccounts51.

The option to convert a vendor or supplier credit to a bill is unavailable in QuickBooks Online. However, you can apply the credit to a bill as payment to reduce the total amount. To learn how to handle vendor credit here's an article: Manage vendor credits in QuickBooks Online

Also, you can use templates to set up a recurring bill and also, how to email your expense receipts and bills to get them into QuickBooks Online:

• How to set up a recurring bill
• Email receipts and bills to QuickBooks Online

I'm only a comment away if you have any questions about managing your bill in QuickBooks Online. Take care and enjoy your weekend. To learn how to handle vendor credit here's an article: Manage vendor credits in QuickBooks Online