The Select Target Groups dialog appears, if you do the following:
Use the dialog to select the points to be measured by using the group they belong to.
The list of point groups offered in the left column of the table depends on the points already selected for the mission. Multi-selection using the Shift key is possible. For all selected groups, the dialog displays the points (point names) belonging to this group in the right column.
Tip - The Default group contains all points that do not belong to any specified point group.