# Using hash-ref assignment:
   $tempa{a}{zeta}  =  {nm=>'abc', sz=>'def'};

 # Using Hash slice --
  @{$tempa{a}{zeta}}{qw[nm sz]} = qw[abc def];

#Resulting structure:
#= {
#    'a' => {
#             'zeta' => {
#                         'sz' => 'def',
#                         'nm' => 'abc'
#                       }
#           }
#  };