Specifying Employee Preferences 
Use
Employee preferences can also be considered when planning shifts. An employee preference is simply a shift preferred by the employee.
Procedure

If you have chosen to display the shift plan in the
classic design , the shift abbreviations are highlighted in different colors.To create an employee preference
To return to the target plan:

If you have chosen to display the shift plan in the classic design, employee preferences are highlighted in different colors.
If you have chosen to display the shift plan in the
color design, the employee preferences are displayed in accordance with the settings made in General Color and Character Formatting. The other shift abbreviations appear in the original default color on the screen.Result
You have taken a working time preference of an employee into consideration during shift planning.