Deleting a Summary Field
To delete a summary field
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Select the summary field on the Summary sheet of the Catalog of Available Fields dialog.
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Click the Delete button on the toolbar of the Catalog of Available Fields dialog.
The summary field is then deleted and removed from the list of summary fields on the Summary sheet of the Catalog of Available Fields dialog.
You cannot delete a summary field that has been applied to your layout until you have removed the applicable fields from your layout.