I want to determine the territories in which customers to a bank has the shortest path. It can be done with desktop software packages or programming if it is needed. Does anybody has idea on how to start doing it? I want to produce a map like this http://www.esri.com/industries/banking/business/~/media/Images/Content/industries/banking/graphics/DesireLineOverlay-lg.jpg and this map only the territories are important for me.
Another option, if you know which point goes to which facility, is Envelope to Polygon.