I run a company that publishes telephone directories for communities. We publish one directory per year for each community that we service and we service half dozen communities. Many advertisers are repeats from previous years and each year may advertise in several communities. As I prepare to build my first database I do not know how to organize the records of my advertisers. Should I make a new file for each community for each year or just have a field within each record that designates which community and year that advertiser is for. Also, when I make a change to the record the next year I do not want to lose some of the info from the previous year such as what size their ad was.