CDO>  RESERVE COLLECTION /CLOSURE=TO_BOTTOM PRODUCT_INVENTORY
  CDO>  DEFINE FIELD PRODUCT_NUMBER
  cont>   DATATYPE BIT SIZE 5.
  CDO>  DEFINE FIELD PRODUCT_DESCRIPTION
  cont>   DATATYPE TEXT SIZE 50.
  CDO>  UNRESERVE COLLECTION /CLOSURE=TO_BOTTOM PRODUCT_INVENTORY

      In this example, the UNRESERVE command cancels the PRODUCT_
      INVENTORY reservation and deletes the two fields that were
      defined.