Pass your $conf object as a parameter to your TestClass method :

sub anything {
  my $self=shift;
  my $conf = shift;
  # do whatever you want here...
  
  return;
}
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And call it this way:

my $conf = new Config;
my $object = new TestClass;
$object->anything($conf);
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Another option is to use a singleton, but it may start endless discussions, see what is a propper way to make a chunk of data accessible to all my packages for retrieval and modification ? for the gory details :)