Although charts in PowerPoint 2007 look so much better than charts in previous versions, the chart type offerings are almost similar. PowerPoint 2007 provides all the basic chart types such as column, bar, line, pie, etc. — and also some advanced charts like radar, surface, bubble, doughnut, etc. To change a chart type from one to another, you first need to have a chart in your presentation. Then follow these steps to change the chart type in PowerPoint 2007.