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my %hash=('ID' => {
                  'key1' => [key1_val1, key1_val2],
                  'key2' => [key2_val1, key2_val2]
                  }
          );

ID, 1, key1_val1, key2_val1
ID, 2, key1_val1, key2_val2
ID, 3, key1_val2, key2_val1
ID, 4, key1_val2, key2_val2

my $id2=1;
my %data=();
...
    }
  }
}