When you use to Move Town feature it is highly recommended to do a Save As and give it a new name, first before moving. Just in case you do want to go back to that saved game.
For example: Let's say you want to move from Moonlight Falls (MF) to Twinbrook (TB).
You then would Save As MF-JD01. After you have moved towns, it will ask you to save again with a new name. This is good. Then what you can do is save the game as: TBJD02.
I would highly recommend saving both of these saved-game files to some place safe (outside of the Electronic Arts folder) just in case you need to refer to them later.
MrsFlynn