Excel 2007 : Multi layered List

HI

Is it at all possible to create a multi layered drop down list, much in the same way the Start bar in windows fuctions.
I have been using excel dashboards for a while now (for readers convenience), however I currently have 144 unique possibilities, split over 4 layers(Region/Cluster/Country/City)

Attached a list of above. Current requirement is for reader to select one of the 144 possibilities to allow toggling between views.

Thanks, but I have tried dependant lists before, and while serves the purpose, not the most effecient means when toggling. At the same time, all 144 entries need to be a possibility, with some of them being layer, 1,2,3 or 4. At present I have all 144 in one list, which is not idealm either