From a Windows XP or Windows Server 2003 domain member, use the following example, whioch queries the OU for all members and pipes them
to a addmbr for the specified group.
dsquery user "OU=OU_TEST,DC=JSIINC,DC=COM"|dsmod group "CN=Accounts Payables,CN=Users,DC=JSIINC,DC=COM" -addmbr