Categories on the other hand are essentially a set of series. If we use a column chart as an example, Series within your Excel sheet show up as the columns. You many also need to add a new Series or Category. When you edit chart data within Excel, the process may not be limited just to changing the values. When you add a new chart in PowerPoint 2013 for Windows, you will see that it has its roots in Excel, and all chart data is also stored within an Excel sheet.
