You can set up areas of a map by clicking on the map of your choice and pressing Shift+Insert, this will open up the Area Dialogue:
Clicking on the Area Position will open this Dialogue Box in which you highlight the area that you want to use for the troops that are there:
Once done that ensure that the Troop box is filled in with the Enemy troops that you want and press enter to close the Dialogue if you look in the Map Name area you should see some drop down "Areas" like:
Hope that helps
This post has been edited by Jonnie19: Aug 16 2011, 08:31 AM