Testcase => 
{'comp' 
   => {'cmd' 
        => {'tc1' 
            => {platform_type => 'all',
                testsuite_type => 'all',
                view => 'private'},
            'tc2' 
            => {platform_type => 'all',
                testsuite_type => 'all',
                view => 'private'}
           }
      }
}

##</code><code>##

delete $hoh{$comp}{$cmd}{$tc1};

##</code><code>##

Testcase => 
{'comp' 
   => {'cmd' 
        => {}
      }
}