Entering Manual Time Specifications/Employment Periods 
Use
You use this procedure to enter any employment or absence periods for an employee that cannot be entered in other infotypes. For example, this may be periods before the system start date or before the employee's hiring date.
Prerequisites
To evaluate these employment or absence periods within
the employment period calculation, you must make the required settings in Customizing for Personnel Administration under Evaluation Bases ® Calculation of Employment Period. In particular, you must ensure that a selection rule exits with the Infotype category. This selection rule selects the periods from the infotype.Procedure
The Maintain HR Master Data screen appears.

If you want to enter several data records for an employee, choose Goto ® List entry to access a list. You use this list for the fast entry of time specifications or employment periods.
Create. The Create Time Specifications/Employment Period screen appears.
Save. Result
The specification or employment period is saved in the Time Specification/Employment Period infotype (0552) and can be selected and evaluated when the employment period is calculated.