How to Work with Charts in Salesforce
You can easily add charts to summary and matrix type reports.
Salesforce adds the selected chart to the report.
Once a chart is inserted into the report, you can edit what it displays.
You can change the chart type, or you can move chart components using the Formatting tab.
The chart is updated with your changes.
If you decide you don't need a chart, you can remove it.
Salesforce removes the chart from the report.