LeaderLines Object (PowerPoint)
Represents leader lines on a chart. Leader lines connect data labels to data points.
Although the following code applies to Microsoft Word, you can readily modify it to apply to PowerPoint.
Use the LeaderLines property to return the LeaderLines object. The following example adds data labels and blue leader lines to series one on the first chart in the active document. If no leader lines are visible, this example code will fail. In this situation, you can manually drag one of the data labels away from the pie chart to make a leader line show up.