Well, for all the years I've been using the scheme, I still have a printed copy on my desk. But looking at any group flag, like 12301, I can see right away that it is for a Red aircraft, group #23, a flag for the entire group, and the group is Dead.
Folks,
Look at the events in the example mission and note how the group name is in the event title. I usually will arrange like events together. An advantage is that the first event of a certain type can be made, and then cloned for the other groups that need a similar event, while there is just a couple of things to change in the cloned event. It works this way with scripts, too. This organization is soo helpful when troubleshooting, and goes to the OP about 'folders' IMO.
WC