Hanson, Rob wrote:
> > Any suggestions on how I can do this?
> 
> Yes.
> 
> # init the hash key
> $hash{four} = {} unless exists $hash{four};

Due to autovivication, this is not necessary.

> 
> # store access the internal hash by following the reference "->"
> $hash{four}->{uid} = "uid4"; $hash{four}->{cn} = "cn4";
> $hash{four}->{group} = "Group4";

n.b., when the -> symbol lies between brackets or braces, it can be omitted.
A bit of syntatic sugar:

   $hash{four}->{uid}

can be written as:

   $hash{four}{uid}

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