I would like the ability to attach Items Groups (or Flat-Rate items) to more than one Category. For example, to streamline my Price Book I would like to make Item Categories for the different types of equipment that my technicians work on (Item Category: Air Conditioner, Item Category: Gas Furnace, etc.). There are multiple Item Groups (or Flat-Rate Items) that would apply to multiple, or all, of the equipment Categories. For example, Item Group: Trace a Low Voltage Short, or Item Group: Install a New Thermostat could be made once and show up in multiple Categories. Having the ability to select multiple Categories for Item Groups would give Price Book much more flexibility and greatly simplify my Price Book management responsibilities.