The Comp Time field is found on the Employees > General > Dates & Hours screen. You can set the threshold for the comp hours for an employee here and any extra time entered above this threshold is tagged as Comp Time instead of the usual Overtime. You can set a frequency and number of hours per period first. This extra time can be banked and then later used in the future. For example, if an employee is scheduled to work 40 hours per week, but works 45 hours instead, CORE banks 5 hours of comp time for the employee, to be used in the future against the comp time activity.