You can add a group in this dialog box, either manually or a pre-existing Active Directory group.

If you add an Active Directory group, the members in the group can also be added.

Note: The members are all members in the particular group, not just computer names, so be sure when you add the members they are computers.

You can add a computer to any group or import computers by right-clicking on the group name and selecting "Add computer/import".

You can add a computer by name, browse the network tree for the computer, or import from a file. The file can be comma, tab, or crlf delimited.