Thanks for your reply! I'm sorry, I wasn't as clear as I could have been

if ( ! exists ( $status{$client}{'policy'}{$policy} )) {
push  @{$status{$client}{'policy'}} , $policy ;
  }
[download]

I'm building a Hash of Hashes of Arrays. In this example, %status is a hash, whose keys are also hashes named $client. Each key "$client" is a hash of arrays. In the above example, there is one key (array) named "policy". "policy" should contain a list of, well, policies.

Ultimately, I'm trying to create something like:

%STATUS {
      Client1,
           Policy,
             [ policy1,
               policy2,
               policy3
             ]
           ID
             [ id1,
               id2,
               id3
             ]

        }
[download]