Identify from multiple cost centers in a department

Hi All,

We know that Multiple cost centres can be associated to a department. So when we assign a department to an employee, how to then tag to a cost centre to a the employee of the department

Scenario:-

Department A has 3 cost centers - CCA1 CC2, CC3. But when an employee is hired or transferred to Department A, which cost center then will the employee be tagged to

Thanks,

Sourav