Your code gives me the error

Odd number of elements in hash assignment at ./t4.pl line 6.

Hashes are defined this way:

my %hash = ( somekey => somevalue, ...);
[download]

So your code should read:

#!/usr/bin/perl -w

use strict;
use Data::Dumper;

my %w =  (     Sub =>
                    {
                        'rbscells' =>
                                        'UtranCell=RNC16-4-1',
                                        'UtranCell=RNC16-4-2',
                                        'UtranCell=RNC16-4-3'
                    }
)
;

print Dumper(%w);
[download]

Now when you look at the output of Data::Dumper, you can see, that what you probably wanted to be an array (the three strings starting with "UtranCell*") are in fact a hash value and another hash key + value:

$VAR1 = 'Sub';
$VAR2 = {
          'rbscells' => 'UtranCell=RNC16-4-1',
          'UtranCell=RNC16-4-2' => 'UtranCell=RNC16-4-3'
        };
[download]

However, you can't just put an array definition inside a hash - from perldsc:

The most important thing to understand about all data structures in Perl--including multidimensional arrays--is that even though they might appear otherwise, Perl @ARRAYs and %HASHes are all internally one-dimensional. They can hold only scalar values (meaning a string, number, or a reference). They cannot directly contain other arrays or hashes, but instead contain references to other arrays or hashes.

So another change, to define an array reference:

...
'rbscells' => [
                                         'UtranCell=RNC16-4-1',
                                         'UtranCell=RNC16-4-2',
                                         'UtranCell=RNC16-4-3' ,
                                        ]
...
[download]

You can access the elements of the array as always, via index starting from 0 or with foreach like this:

foreach my $element (@{$w{Sub}->{rbscells}})
{
    print $element . "\n";
}
[download]

To understand nested data structures in perl, please refer to perldsc, especially the chapter about "Hashes of Arrays".

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