Thanks for your responses! I would like to understand more in details, If you are telling highest is app label ( CGA,HGS,YAG, TAG) then device label (Computer,Mobie) then browser label (IE11,CHROME,EDGE), In the loop, its checking the counts for %pivot hash by $pivot{$app}{$device}{$browser}; ? Can you please elaborate the difference between following code snippet about which sum its doing ++$pivot{$app}{'TOTAL'}{$browser}; ( is this counting total app counts and what about the browser here? Please let me know about this too ++$pivot{$app}{'TOTAL'}{'TOTAL'}; Please check entire for loop

      for ($k = 0; $k <= $#responseid; $k++)  {
    
         next if ($responseclientbrowser[$k] =~ /IE7/i);
        $worksheet1->write($row1,0, $responseid[$k],$format2);
        $worksheet1->write($row1,1, $responsdisp[$k],$format2);
        $worksheet1->write($row1,2, $responsalter[$k],$format2);
        $worksheet1->write($row1,3, $responseclientdevice[$k],$format2
+);
        $worksheet1->write($row1,4, $responseclientbrowser[$k],$format
+2);
        $worksheet1->write($row1,5, $responseapps5[$k],$format2);
        $worksheet1->write($row1,6, $estdate[$k],$format2);
        $app = $responseapps5[$k];
        $device = $responseclientdevice[$k];
        $browser = $responseclientbrowser[$k];
        $userid = $responseid[$k];
        
        #print Dumper $browser;
        
        
        ++$pivot{$app}{$device}{$browser};
        #print Dumper ++$pivot{$app}{$device}{$browser};
          ++$pivot{$app}{'TOTAL'}{$browser};
         # print Dumper ++$pivot{$app}{'TOTAL'}{$browser};
          ++$pivot{$app}{'TOTAL'}{'TOTAL'};
          #print Dumper  $pivot{$app}{'TOTAL'}{'TOTAL'};
          ++$pivot{$app}{$device}{'TOTAL'};
          ++$pivot{'TOTAL'}{$device}{$browser};
          #print Dumper $pivot{'TOTAL'}{$device}{$browser};
        #++$pivot{$app}{$browser};
           ++$categ{'device'}{$device};
           ++$categ{'browser'}{$browser}; 
           ++$app{$app};
    
    $row1++;
    #print Dumper $app;
    
    }
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I have replaced the 'TOTAL' with a more "speaking" label. Pls look at the 'all...' rows and how they represent the sums of the (random) data in each of the blocks:

use strict;
use warnings;
use Data::Dumper;

my %pivot;

# generate 100 random records for app(lications) being accessed thru s
+ome dev(ices) with some bro(wsers)
for(1..100){
    my($app,$dev,$bro) = (qw(App1 App2 App3)[rand 3],qw(Dev1 Dev2 Dev3
+)[rand 3],qw(Bro1 Bro2 Bro3)[rand 3]);
    ++$pivot{$app}{$dev}{$bro};
    ++$pivot{'allapps'}{$dev}{$bro};
    ++$pivot{$app}{'alldevs'}{$bro};
    ++$pivot{$app}{$dev}{'allbros'};
    ++$pivot{'allapps'}{'alldevs'}{$bro};
    ++$pivot{$app}{'alldevs'}{'allbros'};
    ++$pivot{'allapps'}{$dev}{'allbros'};
    ++$pivot{'allapps'}{'alldevs'}{'allbros'};
}

# statistics for accesses
for my $app (sort keys %pivot) {
    for my $dev (sort keys %{$pivot{$app}}) {
        for my $bro (sort keys %{$pivot{$app}{$dev}}) {
            print "$app\t$dev\t$bro\t$pivot{$app}{$dev}{$bro}\n";
        }
        print "------------------------------------------------\n";
    }
}
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