Here is one way to do it:

use strict;
use warnings;

my %h;

while (<DATA>){
  chomp;
  next if length($_) < 30;
  my ($k1, $k2,$k3, $val) =  unpack("A8 x1 A15 x1 A33 x1 A5", $_);
  $h{$k1}{$k2}{$k3} += $val;
}
for my $k1 (sort keys %h){
  print "$k1\n";
  for my $k2 ( sort keys %{ $h{$k1} }  ) {
     print "\t$k2\n";
     for my $k3 ( sort keys %{ $h{$k1}{$k2} }  ) {
        print "\t\t$k3 $h{$k1}{$k2}{$k3}\n";
     }
  }
}
__DATA__
Summary  Detial_Summary  EMC CHECK  abcdefghi AZ_checker 1 20.32
Summary  Detial_Summary  EMC CHECK  abcdefghi AZ_checker 1 24.00
Summary1 Detial_Summary1 EMC CHECK1 abcdefghi AZ_checker 1 20.59
Summary1 Detial_Summary1 EMC CHECK1 abcdefghi AZ_checker 1 24.00
[download]

prints:

Summary
    Detial_Summary
        EMC CHECK  abcdefghi AZ_checker 1 44.32
Summary1
    Detial_Summary1
        EMC CHECK1 abcdefghi AZ_checker 1 44.59
[download]