I've got your back, @Bulko.
All the steps you'll need to create a Bill can be found below, including a brief visual example:
Enter a Bill in QuickBooks Online
- From the dashboard, click the Plus (+) icon. Under the Vendors column, you'll see the Bill option.
- Enter a Vendor, Bill & Due dates, Account details, Description, and Amount as necessary.
- Once finished, select Save and close in the bottom-right corner.

We also offer a detailed video tutorial on entering bills in QuickBooks Online that you may find helpful. With these steps, you'll be entering Bills like a pro before long. Thanks for sharing your question, wishing you continued success.