If the bill is an ACH instead of printing a check, how do I mark it paid so it's not sitting in my unpaid list of bills?

Hi there, bemid. I'll help you with managing bills in QuickBooks Online (QBO).

To ensure that we're on the same page regarding managing your bills in QuickBooks, are you referring to marking a bill paid through ACH transfers? If so, we can normally mark them paid on your company file to keep your records accurate. Here's how:

1. Go to the Expenses menu and select Bills.
2. Under the Unpaid tab, select the Action dropdown beside the transaction you want to mark as paid.
3. Then, hit the Mark as paid.
4. Verify the payment information, and enter the total amount in the Amount field.
5. In the Oustanding Transaction section, select the bills the payment went to.
6. Once done, select Save and Close.

If you paid through Bill Pay, we send the payment out to your vendor using your selected payment method. Moreover, access to your bill payments will always be available including their status on the Bill Pay payments page. Since these are paid via ACH, please take note that this will take up to 3 to 5 business days to process, while the statuses remain not until after the process.

Furthermore, you can get a report on all money paid to a vendor for the year and apply appropriate customization to display important data: Run a report with vendor totals. 

Feel free to comment if you need additional assistance for future transactions you'll be creating in QuickBooks. I'll be right back to answer them. Stay safe!