Hello there, @anonymous6.
You can create a journal entry for those transactions way back in 2018 if you are following the advice of an accountant. Let me show you the steps.
Here’s how:
1. Go to the Hamburger icon.
2. Select the + New button.
3. Select Journal entry. Or if you're in Business view, switch to Accountant view first. Then come back to these steps.
4. Fill out the necessary fields to create your journal entry.
5. Select Save and new or Save and close.
For more information, you can check out creating a journal entry in QuickBooks Online.
Let me know if you have any questions in mind. I’m here to help. Have a good one.