This dialog allows you to specify which device's belong to the group based on a their individual properties such as Role, Name or IP Address as well as any connected devices. First, as with any other device group, the device group name and description can be modified as needed. Then, you can configure the following to set membership for the group:
Click the Device Membership Criteria Edit hyperlink, then:
If you would like other devices connected to those devices currently belonging to the device group you're editing, enable Include Connected Devices, then click the Connected Devices Edit hyperlink and repeat the steps above as needed to refine group membership criteria for any connected devices.