You can add a hole to the middle of your pie chart to create
a donut chart. You can then display something in the hole, such as
a company logo, a calculation, or the legend.
Procedure
Select the pie chart object.
In the Properties pane, set the Hole
size (%) property to the percentage of the pie that you
want the hole to take up.
Tip: You can select
a value from the Hole size (%) list or type
a value that is not listed.