You can change the initial chart type to another by using the following methods:
•Use the commands of the Chart contextual tab.
•On the Format menu, select Chart > Type.
•Right-click to open the context menu and select Chart type.
To change the chart type:
1.Select the chart.
2.Select your preferred chart type by using one of the methods specified above.
3.Select a new chart type from the drop-down menu.