You can record a number of identical structures using one row in the spreadsheet by entering the number in the Quantity column checkbox in Job Control (Project Settings) and a Quantity column will be added to the spreadsheet.
The Quantity column is initially populated with the value 1 since this is the most common entry. Any values greater than 1 must be entered manually. Dips does NOT automatically scan your file and check for identical planes. Quantity data (>1) must be entered manually.