Hello Monks I just send a message not long ago (different hashes?), and I tried your suggestions. I thought it was working because I run the script with a small textfile, but it is not!! :(
It is creating a new hash, adding a new record at the time. it's exponential huge

$VAR1 = {
      'WaterSports' => [
                          '8765',
                          [
                            'Drysuit',
                            'r',
                            'M-L'
                          ]

        };
$VAR1 = {
          'WaterSports'=> [
                          '8765',
                          [
                            'Drysuit',
                            'r',
                            'M-L'
                          ]
                         '8365',
                          [
                            'Paddle',
                            't',
                            '45'
                          ]

                    ]
        };
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This is my modify code:

open(INFILE, "products-id.txt")|| die "Cannot open products-id.txt fil
+e"; 
open (OUTPUT,">$output") or die ("Can't open file $output $!");

chomp(my @ProductArray = map { /^\s*$/ ? () : $_ } <INFILE>);
close (INFILE);

foreach my $line(@ProductArray)
{
  my ($Category, $ID, $Name, $Type, $Size) = split( / /, $line );

  push(@{$AllProducts{$Category}}, $ID, [$Name, $Type, $Size]);

print OUTPUT Dumper(\%AllProducts);

}
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I also tried this

  push @{$AllProducts{$Category}}, ($ID, [$Name, $Type, $Size]);
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Thanks