In Better HR application, Dashboard users can set up new working shifts for employees.  
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1). Go to setting. And click 'Policies' and choose one of the policy type that you want to add new attendance.

2).Click on the 'Attendance' and click '+ Add the custom attendance setting'.

3). Set the Attendance Setting for details (Setting title, Setting Description, Working Days and Hours also). Then click 'Confirm'.

3).Click 'Update Policy' and 'Confirm'.

Here is the tutorial video of how to set up custom attendance.