Good morning, The Jake.
Thanks for taking the time to reach out for support here in the Community. I want to make sure you're able to get the Square fees entered into your QuickBooks Online account.
Many QuickBooks users will actually enter a negative amount for the fee as a line item. This can be done by:
1. Clicking the (+) New icon.
2. Choose Bank Deposit.
3. Add the square fee (negative amount) to the line item.
4. Click Save and close.
You can find out more about syncing Square with QuickBooks here: Sync with Square
It's always a good idea to discuss these types of actions with your accountant as well. If you need any additional assistance please don't hesitate to reach back out.