Based on the code you provided a more perlish way to do what you want is:

#!/usr/perl5/5.6.1/bin/perl


my %data;
while ( <> ) {
    chomp;
    my ( $Fld1, $Fld14, $Fld15, $Fld67 ) = ( split /\|/, $_, -1 )[ 0, 
+13, 14, 66 ];

    if ( $Fld1 != 800 && $Fld1 != 801 ) {
        my $key = join '|', substr( $Fld67, 2, 5 ), $Fld1, $Fld15;
        $data{ $key }{ count }++;
        $data{ $key }{ cost } += $Fld14;
    }
}

for my $l_strSwitch ( keys %data ) {
    print "\n$l_strSwitch|$data{$l_strSwitch}{count}";
}
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