Let me share details about splitting expense accounts into their proper accounts in QuickBooks Online (QBO), Fred4.
If splitting transactions into their respective Category account, you can do so from the For Review tab. If you need to split a transaction that has already been reviewed, you will have to Undo the reviewed transaction and then split it from the For Review tab.
Here's how you can undo the transaction:
Go to Transactions, then choose Bank Transactions.
Locate the transaction in the Categorized tab.
Click Undo under the Action column.
Then after, go to the For Review tab to split the transaction:
Look for the transaction on your For Review tab.
Click to open the transaction, then tap on the Split button.
Provide all the necessary details when a pop-up window appears.
Moreover, I suggest reaching out to your accountant when categorizing to ensure it is accurately recorded. If you do not have an accountant, you can visit this website to find one: Find a QuickBooks ProAdvisor.