You don't need Microsoft Excel to chart data in an existing Excel file; you can simply import that data and chart it entirely in Microsoft Word. Follow these steps: ...

However, if you add a series of data points to a spreadsheet, Excel doesn't know to include these on an existing chart. To include this data, you must manually add the series to the chart.

How to Add Two Lines to a Powerpoint Chart. "Presenters are usually guilty of including too much data in their on-screen charts," says Garr Reynolds, author of Presentation Zen.