The Pie command will calculate percentages based on the totals but, as you may have realized, cannot use the raw data. Instead, the Pivot command is used to perform the counts from a raw data set. Then the output from the Pivot is used to draw the Pie charts.
We just uploaded a new example file called ‘COUNT CATEGORICAL DATA’ that walks through this process. Go to File > On-line examples in DataGraph.
Please take a look at this example (we added instructions in the file) and let us know if this helps or any other questions you have. This may not mimic your data exactly, but hopefully shows you the process of using the Pivot command to process your data.
Here is one of the graphs in this file.