Hi, This code should satisfy your demand:
Data are in a hash whose key is the ID and associated value is an array with the first elements being the name and the desc, and the next ones being the application-names) 
# ------------------------------------------------------------
%Struct = ();
open (IN, "Abnova_Product_List.txt");
while(<IN>)
{ 
    chomp($_);
   ($Key,$Name,$Desc,$OneApp) = split(/\t/,$_);
   
   if (! exists $Struct{$Key})
   {
      $refArray = [$Name,$Desc,$OneApp];
      $Struct{$Key} = $refArray;
   }
   else
   {
      $refArray =  $Struct{$Key};
      push (@$refArray,$OneApp);
   }
}
close(IN);
open (OUT, ">Abnova_Products.txt");
foreach $Key (keys %Struct)
{
  $refArray = $Struct{$Key};  
  print OUT "K=$Key\t".join("\t",@$refArray)."\n";
}
close (OUT);

[download]
There are no "my" are they yours ????
Enjoy ;-)

In reply to Re: Hashes with Multiple Keys and Combining Them by didess
in thread Hashes with Multiple Keys and Combining Them by de2425

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