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

##</code><code>##

#!/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);

##</code><code>##

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

##</code><code>##

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

##</code><code>##

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