$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=1'}{'n=1'} = 'entry1111';
$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=1'}{'n=2'} = 'entry1112';
$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=1'}{'n=3'} = 'entry1113';
$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=2'}{'n=1'} = 'entry1121';
$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=2'}{'n=2'} = 'entry1122';
$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=2'}{'n=3'} = 'entry1123';

# Let's see what we got:
use Data::Dumper; $Data::Dumper::Indent = 1;
print Dumper $href;