You use folders in eCoordinator in the same way you use the folders on your desktop. You can have different folders in the Volunteers work area to keep track of the different groups that your volunteers come from. For example, you might want to keep your volunteer scout troops in a folder called "Scouts." Then, after seeing how many scout volunteers you have, you might decide to organize your scout volunteers by opportunities. Conversely, if you want to see all of your scouts listed together, you just need to click the "All Data" folder selection.
The key to deciding if you want to create new folders, is to determine if it would benefit you to have certain groups of Volunteers, Opportunities, or Organizations separate from the main group.