...  # As before
my @extras  = grep {$_->{status} eq 'Extra'} @$data;
my @mains   = grep {$_->{status} eq 'Main' } @$data;
MAIN:
foreach my $main (@mains) {
    @{$main}{qw/new_name new_ad1 new_city new_z_code/}
        = ('', '', '', '');
    EXTRA:
    foreach my $extra (@extras) {
        next EXTRA if $main->{ID} ne $extra->{ID};
        @{$main}{qw/new_name new_ad1 new_city new_z_code/}
            = @{$extra}{qw/name Ad1 City zCode/};
        last EXTRA;
    }
    print Dumper($main);
}

##</code><code>##

$VAR1 = {
          'City' => 'NY',
          'new_city' => 'BO',
          'new_ad1' => '100 main St.',
          'Ad1' => '20 North Central St.',
          'new_name' => 'Tony Star',
          'zCode' => '0002',
          'state' => 'TO',
          'status' => 'Main',
          'new_z_code' => '0007',
          'name' => 'John D',
          'ID' => '2222'
        };
$VAR1 = {
          'City' => 'NM',
          'new_city' => 'MA',
          'new_ad1' => '44 Dell St',
          'Ad1' => '12th Street',
          'state' => 'CA',
          'zCode' => '2334',
          'status' => 'Main',
          'new_name' => 'Marie Doe',
          'new_z_code' => '9857',
          'name' => 'Charles D',
          'ID' => '1111'
        };
$VAR1 = {
          'new_ad1' => '',
          'City' => 'AA',
          'new_city' => '',
          'Ad1' => '1AAAA',
          'new_name' => '',
          'status' => 'Main',
          'state' => 'PP',
          'zCode' => 'TTTT',
          'name' => 'AKAKAK',
          'ID' => '8888',
          'new_z_code' => ''
        };