...sorry for the repetition.

There's no need to be sorry. I like to see a few versions of a solution. I often pick up handy techniques comparing different approaches.

A minor nit though, your snippet won't compile throws a warning under strict and warnings. This is a bit better.

#!/usr/bin/perl

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

my @arr1 = qw{one two three};
my @arr2 = qw{four five six};
my @mainarr;
push @mainarr, \@arr1, \@arr2;

#print Dumper @mainarr->[1]; # <- line 12

#Using an array as a reference is deprecated at C:\perm\monk.pl line 1
+2.
#C:\perm\monk.pl syntax OK

print Dumper $mainarr[1];

__DATA__
$VAR1 = [
  'four',
  'five',
  'six'
];
[download]

My motto: "Test it _before_ you post it." :-)

update: it does compile ("syntax OK") but it throws a warning