For any number of reasons you may want to move your VIRTUAL CITY from on region to another. Below are instructions for how to do that.
NOTE: You can only move a city to another area of the same size. So if you want to move your MEDIUM SIZE CITY you can only move it to another MEDIUM size area in another region.
Select the area in the region where you want to move to city to be moved to. In this example, I will be moving my city to the Future City premade region.
Click on that area and select the Import City button (the leftmost button).
Select the region where your city is, and then select the name of the city, then click Import City. In this example, I am selecting the Large City region and the Large Mesa city. If you do not see your city listed under the region, it is ineligible for import to the selected area.
Your city will now be moved from its previous location to the selected location.