I am trying to perform a summary on a poly line dataset. This data contains an attribute for the year the section was laid and the diameter of the section. I want to sum the length of these sections group them by both year and band. However I want to group the bands and years e.g year laid 2000-2010 and diameter 150-300 mm. I have created a model which does what I want but I was wondering if there was an easier way to carry out this task. I was also wondering if there was a way to modify the model so that the user could can the year bands and diameters in a table of spreadsheet. I am new to the model builder. Maybe there is a better way to do what I am trying to do. See attached images.