add new populated list of areas under each city in address field module.

I am using Address field module for taking address from user.For this module i need an extra field which has a list of areas based on the parent selection.

For e.g i have country selection there - UAE ,there is a an automatic listing of emirates under UAE.After the Emirate selection there should be a listing of area under the selected Emirate.

According to the UAE(united Arab Emirates) geography we need to divide the address field into Country > Emirates > Area under Each Emirate.
Now the Module has Country > Emirates Selection.
My default and only Country is UAE only.
How can i show the areas when i select an Emirate?
Any patch available for this? This is an urgent need and i am searching for a solution.Please update me.