You can make a radius map with concentric circles around all or a limited set of markers on your map, using the Additions -> Highlight Regions -> Circles menu item on your map.
After you click on the menu item, select the option for “Circle all displayed markers” in the resulting dialog. Set the color and radiuses of your regions and hit Submit. This will make your radius map.
Limit the markers on your map for the regions by: (1) Color, or (2) Search.
1. Limit Markers by Color
Use a map legend for different colored markers (using the Map -> Legend menu item) and then click on the legend at the bottom of the map to de-select and select markers.
2. Limt Markers by Search
Use the View -> Search menu item to search for markers matching some criteria, e.g., all stores within 10 miles of a location.