Thank you for the information you've shared, Jetta2horse. 

To clarify things, yes as mention above Bill.com, will automatically void the 90days check that is uncashed in their system. Though, to fix the balances, you can create a Journal Entry. I also advise consulting your accountant first before doing this process to prevent any discrepancy in your book. 

I also recommend reaching out to Bill.com. This way, they will be able to double-check this issue by pulling up your account and advising the best way, on how to record it to prevent any error in handling the transactions. 

To reach out their customer support, you can visit this link: https://www.bill.com/contact-us/. 

You can refer to this article on how to handle a Journal Entry: Create a journal entry in QuickBooks Online. 

Let me know if you need further assistance about this process. I'll be here to help. Take care.