Changing form-based detail lines Access the detail or header/detail form to be changed. Display the records. If you are working with a detail form, click Inquire to display any existing records. If you are working with a header/detail form, search for the header record. Specify A in the line action code field of one or more blank detail lines. (This field is the left-most field.) Specify or select values for the fields in the detail lines you are adding. Click Change.