lib/
          |
          ----A.pm   #has method new
          |
          ----B.pm   #has method new
          |
          ----C.pm--- #has method new
          |          |
          |          ----C1.pm #has method new
          |
          -----D.pm   #has method new
          
#############################################

##</code><code>##


Package C1;
use File::FindLib 'lib';

use A;
use B;
use C;
use D;

sub new {
   return bless({
        _a   => A->new->bar,
        _b   => B->new->bar1,
        _c   => C->new(),
        _d   => D->new(),
    }, shift);
}


sub foo {
    my ($self) = (@_);
    my $a = $self->{_a};
    my $b = $self->{_b};
    my $c = $self->{_c};
    my $d = $self->{_d};
    
    
    $a->some_method1();
    {
    ....
    #set of operations 
   
    }
    
 }
 
 
 sub abc {
    my ($self) = (@_);
    my $a = $self->{_a};
    my $b = $self->{_b};
    my $c = $self->{_c};
    my $d = $self->{_d};

    $c->some_method2();
    
    {
    ....
    #set of operations 
   
    }
 
 }