To select contacts that belong to one of the on-the-fly groups:

1. Click the button of the selected group
   
   
   
   
2. A window popup will show with selections: Expand, Omit, Selected, and All
   
   Select Expand if you want to add to the currently selected contacts to the selected on-the-fly group.
   Select Omit if you want to omit the contacts under the selected on-the-fly group
   Select Selected to select contacts under the on-the-fly group from only the selected contacts
   Select All to select contacts under the on-the-fly group from all contacts in the system