Im trying to update our db to locate people w/blank city and add the city.  I was told to use export/import.  I exported, added the city, saved the file as CSV again and ready to import.  Do I only map the id and city and no other field since I'm not updating anything else, and do not check the "over write data" box.  This seems right but so often nb doesn't follow standard data base protocol and at this point I sure don't need to be messing up any records in my db!!

Thanks