If so, the options are "Billable," "HasBeenBilled," and "NotBillable." The default is "NotBillable."
You may encounter a business validation error if you mark an item which is not billable in your QuickBooks Online records as "Billable" in Transactions Plus:
Please update the product/service with sales information before marking it as billable.
To fix this, simply go to "Products and Services" in your QuickBooks Online account, find the item you are using, and fill in the "Purchasing Information." The "Expense Account" that you use should have one of the following account types: expense, other expense, other current liabilities, other current assets, other assets, fixed assets, or COGS.