If you wish to delete old information on the pre-populated form you are instructed to cross Box C9 (Delete Line). To do this change the status within Basic Information to G (Given Up). This line is not included in an electronic submission so you could just select the option 'Delete' within the Basic Information screen to remove a line completely.
For more help on SPS call our Adviceline team on 01594 545022 or email us at support@farmplan.co.uk.