Interactive charts consist of two layout elements: graphical elements (for example, Chart bars or pie slices) and axis labels. When you add items to a chart, they become values or dimensions in your report.
To add a chart item:
Select a Chart item and choose Add item on the shortcut menu.
The x axis, y axis and z axis submenus are displayed. The z axis submenu does not display for a pie chart.
Select a data label item from the x axis (or Z-Cluster for a clustered chart, or Z-Stack for a stacked chart) submenu to add a third dimension to the chart.