Custom regions allows data to be mapped to the regions that matter most to you, even if they are not the traditional zip code, county, state, or country regions. Custom regions are useful for scenarios involving sales districts, school districts, congressional districts, land lot development, crop rotation, geological analysis, and anything else using custom-defined polygons.
You can import .KML or .SHP files that contain custom polygons. Once imported, you can use custom regions in the same manner as you would use standard regions such as zip codes.
Import a custom region file
Open a 3D map.
The 3D Maps window appears.
On the Home tab, in the Map group, click Custom Region.
The Manage Custom Region Set dialog box appears.
Click Import New Set.
In the File name box, browse to and select the file you want to import, and then click Open.
The Manage Custom Region Set dialog box appears, with the file listed in the Set Name box.