how to create sub-groups within a main group
 

Hi,
How do you creat sub-groups at the same level (i.e. level2) within the main
group (i.e. level1). Also, how can one use efficiently the level tabs for the
rows and collumns when u create the groups. I tried to create sub groups but
instead of each collumn having its individual "+/-" sign, it got extended
each time i tried to add a subgroup. Lastly, how does the dot / bullet that
appears at the grouped row/collumn work when a group is created?

Many thanks in advanced
decipherZ