ADManager Plus provides the ability to modify the members of groups by just importing from a CSV file. To perform this operation follow the steps below:
Select the AD Mgmt tab.
Click the Modify Group link under CSV import.
This option allows you to change or modify the members only. you cannot change the scope of the group here.
Select the domain and the group to be modified.
Import the members list from a CSV file or select the members. You can also delete the existing members from the group.
Click save to update the information in Active directory.