Your first step strikes me as unnecessary. I'm guessing that you're trying to avoid accidentally putting data in the wrong cells because some cells data is not there. But as long as you go through all of the products and sups when you output the data, you shouldn't have a problem.

The benefit of your solution is that you could do something like:

for my $prod ( keys %rowhash ){
   for my $sup ( keys %{$rowhash{$prod}} ){
      print "$rowhash{$prod}{$sup}{DATA_F}, $rowhash->{$prod}{$sup}{DA
+TA_S}\t";
   }
   print "\n";
}
[download]

...because all of the options are encapsulated in each row, but that is sort of treating a hash like an array. If you skip your first step of populating the hash with empty values, you should still be able to do something like:

for my $prod ( @total_pid ){
   for my $sup ( @total_sup ){
      print "$rowhash{$prod}{$sup}{DATA_F}, $rowhash{prod}{$sup}{DATA_
+S}\t";
   }
   print "\n";
}
[download]

Because you always know what your complete list of products and sups are.

perl -e 'split//,q{john hurl, pest caretaker}and(map{print @_[$_]}(joi
+n(q{},map{sprintf(qq{%010u},$_)}(2**2*307*4993,5*101*641*5261,7*59*79
+*36997,13*17*71*45131,3**2*67*89*167*181))=~/\d{2}/g));'
[download]