First - Create your lower more detailed map either for each country. Add all the nodes to the relevant maps. You will then have maps in your left hand pane of map maker called for eg CountryA and CountryB
Second - Start a new map and Drag the Country A and B Maps from the lef hand pane of map maker to the new map. Change the graphic as desired. Save this appropriately for example Company Status.
You now have a tiered map. You can then use the same method if you wanted to break the countries into cities and then into factories.(3/4layer)
Thanks for the fast answer. I'll try it .