Below is the simple code that builds the multi-hash data structure..

use Data::Dumper;
use Tie::Autotie 'Tie::IxHash';

tie my %Menu_Multi_Hash, 'Tie::IxHash';

$Menu_Multi_Hash{'L1A'}{'L2A'} = undef;
$Menu_Multi_Hash{'L1A'}{'Second'} = undef;
$Menu_Multi_Hash{'L1A'}{'L2A'}{'L3A'} = undef;
$Menu_Multi_Hash{'L1A'}{'L2A'}{'L3B'} = undef;
$Menu_Multi_Hash{'L1A'}{'L2A'}{'L3A'}{'L4A'} = '/path/to/exe';
$Menu_Multi_Hash{'L1A'}{'L2A'}{'L3A'}{'L3B1'} = '/path/to/exe';
$Menu_Multi_Hash{'L1A'}{'L2A'}{'L3B'}{'L4A'} = '/path/to/exe';
$Menu_Multi_Hash{'L1A'}{'Second'}{'L3B'} = '/path/to/exe';
$Menu_Multi_Hash{'L1A'}{'Second'}{'Third1'} = '/path/to/exe';

print Dumper(\%Menu_Multi_Hash);
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The output is as follows:

$VAR1 = {
          'L1A' => {
                     'L2A' => {
                                'L3A' => {
                                           'L4A' => '/path/to/exe',
                                           'L3B1' => '/path/to/exe'
                                         },
                                'L3B' => {
                                           'L4A' => '/path/to/exe'
                                         }
                              },
                     'Second' => {
                                   'L3B' => '/path/to/exe',
                                   'Third1' => '/path/to/exe'
                                 }
                   }
        };
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Hence, I was under the impression that if I can achieve this in an efficient way, I will get a multi-hash to use with the CGI:Explorer module.

Please advice if my approach is wrong.