Hello,
Creating time entries in QuickBooks Online makes it so simple to keep track of the hours worked by your employee. You have to option to make this time cost billable to your customer with the click of a button. I'd be happy to explain why some of your employees are defaulted to appear as Billable, while others may not be.
This is based off of the employee's previous time activity. If you used the Billable field last time you created a time activity, this will remain checked off for the next one you create. If you check off the box for Billable, this setting will remain the same moving forward.
For more information about single time activities, take a look at this article: Enter a single time activity timesheet.
I hope this helps make sense of this setting. If you have any other questions or concerns, please reach out to our tech support team for further assistance.
Cheers.