You must enter the location that the piece of equipment is at. When you add a new piece of equipment, you enter the Type and Manufacturer. After you enter those two, the Model No combo box will be filled in with all model no’s of that type and manufacturer. If the Model No is not in the list, you can enter it in and will show up underlined. Also, it will be added to the Master Equipment Type list so that the Model No will show up next time.