$hashref->{personal} = $arrayref;
# Results in:
{
  name        => "Harsha",
  designation => "Manager",
  personal    => ["Country", "location", "language"],
}

##</code><code>##

@{$hashref}{@$arrayref} = ();
# Results in:
{
  name        => "Harsha",
  designation => "Manager",
  Country     => undef,
  location    => undef,
  language    => undef,
}