You're always welcome, @MariaMager. I'd like to share some insights about importing bills/checks to QuickBooks Online.

The option to import bills using a CSV file is currently unavailable in QBO. You'll want to browse through the Intuit Marketplace and look for an available third-party importer tool that you can integrate with QuickBooks. 

You can filter the list by entering the word "import" into the website's search bar. Also, we have a separate forum called Intuit Developers where you may get assistance if you need it with app suggestions and integrations. You may find and interact with professional developers on this website.

They can offer real-time advice on the best tools for you and assist with app choices.

On the other hand, you can import checks into QBO by using a CSV file. Simply ask your bank for the file, and then manually upload it to QuickBooks.

If you're all good, feel free to read this handy article to know more about handling downloaded transactions in QBO: Categorize and match online bank transactions in QuickBooks Online.

You can also check out this guide about matching balances in your account: Reconcile an account in QuickBooks Online.

Keep in touch so we can help your further with importing or with QuickBooks in particular. Take the best care!