If you want to split the employees in the departments in the same way as they are in the employee management today on a previous month, go to Data diagnosis - Tools - Utilities on periods and and degrees of occupation - Update occupation rate - Departments for a period :

Select the period to be modified: 

It is possible to make another one without going out completely:

This utility can be used if, for example, the structure of the departments codes has been modified during the year or if you decide to use the notion of departments when the year is already in progress.

The program stores the codes for each person every month, so putting information in the employee management today does not automatically affect the months that have already been closed.

If nothing has been done so far, the easiest way is to assign the current analytical accounts to the periods that have already elapsed and to modify them if necessary with the Occupation rate by departments utility.