When you add a chart to a document created in Word 2007, a sample chart is embedded in the document. The data used to plot the sample chart is stored in an Excel 2007 worksheet that is incorporated into the Word file. (You don’t have to maintain a separate Excel file.)
You can’t see charts in Draft or Outline view.
To customize the chart, you replace the sample data in the Excel worksheet with your own data, in much the same way you would enter information in a table. Because the Excel worksheet is linked to the chart, when you change the values in the worksheet, the chart changes as well.