To update a summary field
On the Catalog of Available Fields dialog, select the summary field that you want to update, by clicking on it.
Click the Update button on the Catalog of Available Fields dialog toolbar.
The Update Summary Field dialog is then displayed.
Make the required changes on the dialog. For details about entering your specifications, see "Creating a Summary Field", in the previous subsection.
Click the Apply button to complete the update of the script. Alternatively, click the Close button without clicking the Apply button to abandon your entries.
The summary field is then updated with your changes.
You cannot rename a summary field that has been used in a script field.