When you modify an existing time ticket and reduce the hours and then click the save button, the system asks you if you want to create a write down time ticket. If you want to keep track of non-billable work, overstated hours, etc., you should answer yes to this question. A second time ticket is created for the difference in the hours reduced and categorized as a non-billable ticket with text appended indicating this is the secondary ticket. These tickets never appear on actual client bills. They do come out on certain reports dealing with time and productivity. This can be a good management tool!