To animate a line graph in PowerPoint, you need to open the slide, draw the Graph add the labels and then animate the graph as explained here.

Learn how to create an org chart (Organizational chart or Organogram) in Microsoft PowerPoint without using any external add-in service.

Start the PowerPoint application and use the "File" menu to open the presentation containing the graph to which you wish to add the callout.

Removing data from a chart in PowerPoint 2010 is similar to creating one. You choose to edit the chart and the familiar Microsoft Excel window pops up, enabling you to remove columns, rows and cells.