One of the nice features of the Buddy List® is placing your buddies into groups for better organization. The default set of groups include AIM Bots, Buddies, Family, Co-Workers, Recent Buddies, and Offline. You can also create new groups to better categorize your buddies.
The order of the groups in your Buddy List can also be changed. However, the Recent Buddies and Offline groups will always remain at the bottom of your Buddy List.
To move a group in the Buddy List, just drag the group row to a new position. You can do this by clicking on the group row and holding down the mouse button as you move the cursor. As you move the cursor below other groups in the list, you will see a blue line indicating a valid drop zone. The cursor must be moved over the triangle disclosure buttons in order for the blue line to appear. When the blue line is in the location where you want to place the group, release the mouse button. The group row will then be moved to the new location.
This may seem a little tricky at first, but once you get the hang of it, you will find that moving groups is very easy.