An Activity Type is what your employees will use to specify how they spent their time when entering a timesheet. Go to Settings –> Activity Types to add, remove or edit Activity Types. An Activity Type can only be removed if no timesheets have been added against it. If you want to allow unbillable Activity Types to be logged against projects, go to Settings –> Working Time / Reminders and answer Yes to the question “Allow unbillable activity type in projects? *“.