A feature layer must be loaded into ArcMap in order to use this tool. Select the feature layer
you wish to process from the drop-down box. The categorical fields from the table will be
listed in the next drop-down box; select the field you wish to summarize. If there
are any selected features/rows you can elect to use only the select set of records by checking the
"Use selected features only" checkbox. Press the OK button and the summed value will be reported
in a textbox, from which they can be copied and pasted into another application.