You can also confirm Billing for multiple Tasks. Select the desired Tasks by using the checkbox (as highlighted in the screenshot below); then right click on any of the selected Tasks and click on Confirm.
You can then choose to confirm the Billing for either the Actual Time or the Scheduled Time for each Task. So for example, if the Scheduled Time is 10am – 11am but the Actual Time worked was 10am – 10.30am, and you opt to confirm Billing (or Wages) for the Actual Time, then the Billing will be set for only half an hour, despite the Scheduled Time being set for 1 hour.