Re-using a parser I have applied on PM several times now:

use strict; 
use warnings; 
use Data::Dumper;

my %tcl;
my $ptr;
my $threshold = 3;

sub store_word {
  my ( $level, $word ) = @_;
  $word =~ s/^\s+//g; 
  $word =~ s/\s+$//g; 
  return "" unless $word;
  if( $level <= $threshold ) {
    $tcl{$word} = {} if not defined $tcl{$word};
    $ptr = $tcl{$word};
  } else {
    my ( $call, $value ) = split / /, $word;
    $ptr->{ $call } = $value;
  }
  return "";
}

while(my $input = <DATA>){ 
  my $level  = 0; 
  my $word   = ""; 
  my %action = ( 
                '{'       => sub { $word = store_word( $level++, $word
+ ) }, 
                '}'       => sub { $word = store_word( $level--, $word
+ ) }, 
                'default' => sub { $word .= shift }, 
               ); 
  
  ( $action{$_} // $action{'default'} )->($_) for $input =~ /./g; 
} 

print Dumper(\%tcl);
print $tcl{'Make Cal l'}{'CumulativeSuccessfullyEstablished(calls)(In)
+'}, "\n";

__DATA__ 
{{Register {{CumulativeActive(calls)(In) 0} {CumulativeSuccessfullyEst
+ablished(calls)(In) 0} {CumulativeSuccessfullyCompleted(calls)(In) 0}
+ {CumulativeUnsuccessful(calls)(In) 0} }}} {{{Make Cal l} {{Cumulativ
+eActive(calls)(In) 0} {CumulativeSuccessfullyEstablished(calls)(In) 0
+} {CumulativeSuccessfullyCompleted(calls)(In) 0} {CumulativeUnsuccess
+ful(calls)(In) 0} }}} {{Initiating {{CumulativeA ctive(calls)(In) 0} 
+{CumulativeSuccessfullyEstablished(calls)(In) 0} {CumulativeSuccessfu
+llyCompleted(calls)(In) 0} {CumulativeUnsuccessful(calls)(In) 0} }}} 
+{{Summary {{CumulativeActive(calls)(In) 0} {CumulativeSuccessfullyEst
+ablished(calls)(In) 0} {CumulativeSuccessfullyCompleted(calls)(In) 0}
+ {CumulativeUnsuccessful(calls)(In) 0} }}}
[download]

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