As I want to continue to use Keys for this, even though I think that the nested array structure will work just as well, I came up with the solution below using the suggestions from this thread here.

#!c:\Perl\bin\perl
use warnings;
use strict;
use diagnostics;
use Tie::IxHash;
use constant KANRI_01_0    => 0x00000001;
use constant KANRI_01_1    => 0x00000002;
use constant KANRI_02_0    => 0x00000004;
use constant KANRI_02_1    => 0x00000008;
use constant KANRI_03_0    => 0x00000010;
use constant KANRI_04_1    => 0x00000020;
use constant KANRI_04_2    => 0x00000040;
use constant KANRI_04_3    => 0x00000080;
use constant KANRI_04_4    => 0x00000100;
use constant KANRI_05_1    => 0x00000200;
use constant KANRI_05_2    => 0x00000400;
use constant KANRI_06_1    => 0x00000800;
use constant KANRI_07_1    => 0x00001000;
use constant KANRI_07_2    => 0x00002000;
use constant KANRI_07_3    => 0x00004000;
use constant KANRI_07_4    => 0x00008000;
use constant KANRI_07_5    => 0x00010000;
use constant KANRI_08_1    => 0x00020000;

sub ordered_hash_ref {
    tie my %hash, 'Tie::IxHash', @_;
    return \%hash;
}

tie my %menuHash, 'Tie::IxHash', Outer1    => ordered_hash_ref( O1Inne
+1    => KANRI_04_1,
         O1Inne2    => KANRI_04_2,
         O1Inne3    => KANRI_04_3,
         O1Inne4    => KANRI_04_4,
    ) ,
    Outer2    => ordered_hash_ref( O2Inne1    => KANRI_05_1 ),
    Outer3    => ordered_hash_ref( O3Inne1    => KANRI_06_1 ),
    Outer4    => ordered_hash_ref( O4Inne1    => KANRI_07_1,
         O4Inne2    => KANRI_07_2,
         O4Inne3    => KANRI_07_3,
         O4Inne4    => KANRI_07_4,
         O4Inne5    => KANRI_07_5,
    ),
    Outer5    => ordered_hash_ref( O5Inne1    => KANRI_08_1 ),
    ;

for my $mainMenuItem ( keys %menuHash ) {
        print $mainMenuItem."\n";
        for my $subMenuItem ( keys %{ $menuHash{$mainMenuItem} } ) {
            print "$subMenuItem = $menuHash{$mainMenuItem}{$subMenuIte
+m}   ";
        }
        print "\n";
    }
[download]

This provided the following output.

Outer1
O1Inne1 = 32   O1Inne2 = 64   O1Inne3 = 128   O1Inne4 = 256   
Outer2
O2Inne1 = 512   
Outer3
O3Inne1 = 2048   
Outer4
O4Inne1 = 4096   O4Inne2 = 8192   O4Inne3 = 16384   O4Inne4 = 32768   
+O4Inne5 = 65536   
Outer5
O5Inne1 = 131072
[download]

After reading the Tie::IxHash help, then doing an online search using the keyword "preserving", helped me find other resources. I hope that this post helps others and thank you to Granfather and Toolic for your replies to my request for help.

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