This dialog appears when you click Insert > Summary (or click the Insert Summary button 
on the Insert toolbar). It helps you to insert a selected or newly created summary into a report. See the dialog.
The following are details about options in the dialog:
Summaries
To create a new summary, select <Create...> from the drop-down list; to insert an existing summary into the report, select it from the drop-down list.
Function
Lists functions available for the selected field to be summed on.
Sum On
Displays the field that is to be summed on.
Group By
Specifies the field used to group the data. If selected, a summary of each group will be calculated.
Special Function
If the group by field is of Numeric/String/Date/Time type, you can select a special function for the field in the Special Function drop-down list to further specify to which level the data will be grouped by. If Customize is selected, the Customized Function dialog will be displayed, in which you can set the function by your own.
Insert
Inserts the selected or newly created summary into the report.
Cancel
Does not retain any changes and closes this dialog.
Help
Displays this help document.
