You can only export the Current Group. If you want to export only a portion of the contacts in the Current Group, create a new lookup that will identify just those you want to export.
Tutorial: Exporting a Current Group
|1.||Create the group you want to export. |
|2.||Select or (same thing).|
|3.||Select the fields you want to export. (Press Save Default Fields to remember the selected fields for next time.)|
|5.||Press the desired output button.|