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To link a check to a bill, you have to create a Pay bills transaction for the Vendor. I'd be glad to show you the steps.
If you don't have a recorded Bill yet. Follow the steps below:
To link a Check to a Bill, create a Pay Bill transaction. Here's how:
Here's how it looks like.
For more information, check out this article: Record vendor prepayments or deposits for prepaid parts or services.
For future reference, this article can be helpful in voiding check payment in QuickBooks Online: Void or delete a bill or bill payment check.
Let me know if you wanted to ask further assistance. I'll be here ready to back you up. Take care.