Thanks for getting back to us, @Kharp. Confusion no more, I'm here to clarify your concerns about the billable column in QuickBooks Online. 

Let's get this sorted out. This way, you can identify if it is already billed or not.

The No on the report means the bill is not affecting the customer's account yet. It's billable but isn't applied to any customer transactions.

For now, the only way to determine if a transaction wasn't tagged as billable is if the Billable column (Transaction List with Split report) is blank. That being said, if the transaction does not have a Yes under this column, you can click on the amount to open it. Then, edit the transaction accordingly.

In case you'll need to run reports in QuickBooks Online, you can click here. This includes instructions on how to modify and memorize them.

Please know that I'm only a few clicks away if you have any other concerns about reports. It'll be my pleasure to assist you. Have a wonderful day.