You could use the Column Property, Value Labels and use the additional column as the values for the Value Labels (script would have to be written to populate the column property).
Or, you could us "Add Graphics Script" to the Graph Builder, and display the labels that way.
Thanks, Jim. I could use your help with scripting this. I've attached a data table with the graph script embedded in the table. I would like to replace the % by Site labels with values from Column 'N'.
Column "N" seems to be the number of rows of each category. So in this example you could use the "Label by Row" option instead of "Label by Value" to get what you want.
I agree with MS. If you go to your data table, and turn on labeling for column "N", and then go back to the graph and change the "Label" from "Label by Value" to "Row Label", what will be displayed, will be the value from the column(s) where the labeling row state has been turned on.