Best way to Global transfer large number of managers?

Summary:

We need suggestions on best way to Global transfer large number of Line managers from one Legal Employer to another i.e. say from LE1 to LE2.

We had tried Mass Legal Employer Change, but in that case Line manager's new assignment number was not updated in direct reports Employment info records. These direct reports were the ones who were not transferred at the same time.

Please refer :

Please let us know the best practice you follow when large number of managers needs to be transferred, while also ensuring that their direct report's line manager new assignment also get updated.