Replicating security groups from existing to new user (already created)

Replicating security groups from existing to new user (already created)

Scenario: A new user account (User A) was created and the user has already logged in and is using the AD/Email Account. His account was not copied from an existing user and hence is only member of default group Domain Users. Now, the manager wishes to give User A the same access as an existing user (User B) who is a member of 100+ groups.

Is there a way to copy all security groups from User B to User A using ADManager without deleting/recreating User A?

Thanks in advance!

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