Go to SCHEDULING and select the department the employee works in (if the schedule is published, you will need to unpublish it). If you are adding a new schedule, click the + green icon and at the bott...

This is the How to Manage Shifts for TIMEwellSCHEDULED. The fully tailored time and attendance with employee scheduling enhances your workforce management capability.      

Please read the help document here: Override a Shifts Meal/Lunch Break Length