Thank you for adding your first post, Napatire. I'm here to help you post your vendor check accordingly to pay your pending bill.

When writing a check, the bill will be displayed in the right section under Add to Check once it's still pending or open. Paid vendor bills will no longer appear there.

For now, you can open your bill and see if no payments or credits applied to it.

1. Click on Expenses at the left pane, then select Bills.
2. You may modify the Filter to narrow down the result.
3. Look for the bill.
4. Ensure that it's still unpaid so you can pick it up when writing a check. Or, you can directly tap on the Mark as paid tab under Action to complete the payment.

If the bill is still unpaid but never shows up under Add to Check, you can try to issue the payment through a private window to narrow down the result. You can use either of these keyboard shortcuts to save you time:

• Safari: Command + Shift + N 
• Google Chrome: CTRL + Shift + N
• Mozilla Firefox or Microsoft Edge: CTRL + Shift + N

Once done, you can switch back to your regular browser to start fresh. You may also utilize other supported browsers for the best QuickBooks experience.

Alternatively, you can delete and recreate your bill to narrow down the result.

On the other hand, I'm adding this material for more tips while tracking your vendor bills and payments in our system: Enter and manage bills and bill payments in QuickBooks Online.

Please let me know if you have follow-up questions while working with your vendor transactions in QuickBooks. I'm just a few clicks away to help. Have a good one!