The dialog appears when you right-click a table or a table column and select Insert > Summary Column from the shortcut menu. It helps you to insert new summary columns into a table.
The followings are details about options of this dialog:
Resources
Lists all the available data resources that can be used in a summary column. Select the resource you want from the list. If the table is created on a business view, you can also create a dynamic resource to use in the summary column.
OK
Inserts the column with the specifies resource and closes the dialog.
Cancel
Does not retain any changes and closes the dialog.
Help
Displays the help document about this feature.