#!/usr/bin/perl
use warnings;
use strict;
use Data::Dumper;

my $aref = [1, 7, 6, 2, 2, 7, 1, 2, 6, 99, 99, 7, 88, 7, 6, 1, 2, 3];
my (@temp, @result);
my $target_ref = \@result;

for my $num (@$aref) {
    $target_ref = \@temp if $num == 6;
    push @$target_ref, $num;
    $target_ref = \@result, @temp = () if $num == 7;
}
push @result, @temp;
print Dumper \@result;