Hello there, sk33.

When you write Checks to pay for existing bills, the two transactions won't be linked. The bill remains in an unpaid status. You can either delete the check or delete the bill. If you want to keep the bill you'll want to use the Pay Bills option to pay it. If you wish to retain the Check, you may not need to create a bill and directly post it to the bank instead of the Accounts Payable account. 

Here's how to pay a bill:

1. Go to the Vendors menu and select Pay Bills. 
2. Look and select the bill to pay. 
3. Select the bill payment details and click Pay Select Bills. 

To know more on how to handle vendor transactions, you can use these links:

• Bill shows as unpaid after writing a check in QuickBooks Desktop
• Accounts Payable workflows in QuickBooks Desktop

Let me know if there's anything else. Take care and have a great day!