Check th following help and training videos and doc and get the basic idea of Territory Management: https://help.salesforce.com/HTViewHelpDoc?id=territories_def.htm&language=en_US https://www.youtube.com/watch?v=DNQMf1c6sf0 https://www.youtube.com/watch?v=ShPLouLH27c
https://help.salesforce.com/HTViewHelpDoc?id=territories_def.htm&language=en_US
https://www.youtube.com/watch?v=DNQMf1c6sf0
https://www.youtube.com/watch?v=ShPLouLH27c