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$VAR1 = 'ng1';
$VAR2 = [
...
          'ng3_3',
          'ng3_4'
        ];

 [0]            ng1
  [1][0]          ng1_1
...
  [5][1]          ng3_2
  [5][2]          ng3_3
  [5][3]          ng3_4

# &findElementPosition(\@tree,"ng1_1_1_u3");
#
...
    }
  }
}

[1][1][1][2] ng1_1_1_u3

pop @position;
$position[-1]--;