%hoh = { 
'comp' => 
   { 'cmd' => 
       { 
         'tc1' => { 'platform_type' => 'all', 'testsuite_type' => 'all', 'ccc_id' => '2', 'view' => 'private' },

         'tc2' => { 'platform_type' => 'all', 'testsuite_type' => 'all', 'ccc_id' => '2', 'view' => 'private' } 
       } 
   } 
}; 

##</code><code>##

delete $hoh{'comp'}{'cmd'}{'tc2'};