You use this tab to specify which hours in each day are work hours for the employees working according to this shift schedule or for departments.
Select the time intervals that are working time and mark selected as Working time by using the button at the top of the form.
The "Work schedule (create)" form. The Work Days tab
Specify the work days by entering the work hours per day for this work shift. On the Work Hours tab, you can specify for each day which particular hours are work hours. Note that you can split an hour in four 15-minute intervals, for instance to mark a 45-minute lunch break as non-working time.