You are using the same keys to the same database each time so, of course, it blows away the previous values.

You could incorporate the order number into each key:

  sub dborder
  {
      dbmopen(%order, "order", 0644) || die "Unable to open db : $!";
          $order{'o'} = $order;    
          $order{"name$order"} = $name;
          $order{"address$order"} = $add;
          $order{"city$order"} = $city;
          $order{"state$order"} = $state;
          $order{"zip$order"} = $zip;
          $order{"country$order"} = $country;
          $order{"email$order"} = $email;
          $order{"cost$order"} = $cost;
          $order{'a'.$order} = [@food];
          $order{'b'.$order} = [@fries];
          $order{'c'.$order} = [@onionrings];
          $order{'d'.$order} = [@drink];
          $order{'o'}++;
      
      dbmclose(%order) || die "Cannot close dbm file.\n";
  }
[download]

Or you could just store all of this under a single key that is the order number if you use something like MLDBM (?) to serialize your Perl data structures. Since you aren't already using MLDBM, I don't think your [@food] will actually store anything useful in the database. But then I don't know much about this kind of thing (and wasn't going to reply) so I hope this is of some help.

        - tye (but my friends call me "Tye")