Is possible. Please change from the following.

How to create

Setting "Employee"＞Employee settings > [Display]> [Edit]> Basic information " Employee code」

Note

• If you change the employee code, the login ID of the target person will also be changed automatically.

The ID is automatically generated according to the rule "Company code + 3 + Employee code".

• Employee code can only be manually operated on the management screen. It can be changed.
  It is not possible to change all at once by CSV import.