Now that I understand your requirements, I can suggest a faster algorithm. Replace the temporary array @extras with a temporary hash. Use ID values as hash keys. An inner loop to search for a match is no longer necessary - just use a hash look-up. 
use strict;
use warnings;
my @data = [
... # same as before
];
my %extras;
foreach (@$data) {
    $extras{$_->{ID}} = $_ if $_->{status} eq 'Extra';
}
foreach my $main (@$data) {
    next if $main->{status} ne 'Main';
    # Autovivify new keys with default values
    @{$main}{qw/new_name new_ad1 new_city new_z_code/}
        = ('', '', '', '');
    if (exists $extras{$main->{ID}}) {
        # Update values with 'extras' if they exist
        @{$main}{qw/new_name new_ad1 new_city new_z_code/}
            = @{$extras{$main->{ID}}}{qw/name Ad1 City zCode/};
    }
    print Dumper($main);
}

[download]

OUTPUT: Same as in Re^5: Add new rows and data to array. above

Bill

In reply to Re^5: Add new rows and data to array. by BillKSmith
in thread Add new rows and data to array. by Anonymous Monk

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