code: def get_cli(cls) -> click.Group:
          
          main = super().get_cli()
  
          @main.group()
          def bel():
              """Manage BEL."""
  
          cls._cli_add_to_bel(bel)
          cls._cli_add_upload_bel(bel)
  
          return main
docs: Get a :mod:`click` main function with added BEL commands.