The EXTERNAL FILE DELETE option is designed for the deletion of the external file definition. In this case, the menu displayed lists the various external files and you identify the external file you wish to delete.
The file deleted is BAEX##.DAT. The '##' is replaced by the menu number for the selected file to delete. In addition, the reference to the file is removed from BAUS00.CTL. This file is used to display the menu of external files.