Just to see if this could be done :)

NOTE: I faked the rest of your object since yours was incomplete :(

#!/usr/bin/perl -l

# https://perlmonks.org/?node_id=1229668

use strict;
use warnings;

my $CustomField = bless {
  foo => 1,
  values => bless({
    maxvalues => 1,
    name => 'Case type',
    }, 'ClassOne'),
  bar => 2,
  }, 'ClassTwo';

use Data::Dumper; print Dumper $CustomField;

print '$CustomField->Values->Name = ', $CustomField->Values->Name;


######################## just add this ( hehehe :)

sub UNIVERSAL::AUTOLOAD
  {
  my $basename = (split /::/, $UNIVERSAL::AUTOLOAD)[-1];
  $basename eq 'DESTROY' and return;
  my ($realname) = grep lc $basename eq lc, keys %{ $_[0] };
  defined $realname or die "Missing the key '$basename'";
  return $_[0]{$realname};
  }
[download]

Outputs:

$VAR1 = bless( {
                 'values' => bless( {
                                      'name' => 'Case type',
                                      'maxvalues' => 1
                                    }, 'ClassOne' ),
                 'bar' => 2,
                 'foo' => 1
               }, 'ClassTwo' );

$CustomField->Values->Name = Case type
[download]

Finally I got it: the correct way was: $CFVs->{custom_field}->{values}->{name}; Thanks for your help

This abuses the internal representation of the object and breaks encapsulation. It can also bypass triggers or similar advanced features.
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

but I am getting error.

Hello danny20085. It might not have occurred to you but the exact text of that error message is going to be very useful to anyone trying to help you, as would the class name of the object. An SSCCE would be better yet.

#!/usr/bin/perl -l
# https://perlmonks.org/?node_id=1229668

use strict;
use warnings;

my $OutsideObject=
  bless( {
    'first_row' => 0,
    'aliases' => [],
    'is_limited' => 1,
    'joins_are_distinct' => undef,
    'limit_clause' => '',
    'custom_field' => bless( {
           '_class' => 'RT::CustomField',
           'original_user' => undef,'_SB_Record_Primary_RecordCache_ke
+y' => 'id=17',
           'fetched' => {'valuesclass' => 1,
               'order' => 1,
               'canonicalizeclass' => 1
            },
           'values' => {
                    'description' => 'Tipo de caso a ser tratado',
                    'maxvalues' => 1,
                    'name' => 'Case type',
                    'valuesclass' => undef,
                    },      #### LINES ADDED
                           #### To complete 
             },
             'CUSTOMCLASS'),  #### Missing information
     },  "OUTER_CLASS");      ### From your post

my $CustomField = $OutsideObject->{custom_field}; 
print  "VALUES->NAME = ", $CustomField->Values->Name , "\n";

BEGIN{
package CUSTOMCLASS;
sub Values {
    my ($self) = @_;
    $self->{_INTERNAL_POINTER}  = "values";
    return $self; # Allow chaining 
}

sub Name{
    my ($self) = @_;
    $self->{_INTERNAL_POINTER} and return $self->{ $self->{_INTERNAL_P
+OINTER} }->{name};
    return $self->{name};
}
 
1;
}
[download]

VALUES->NAME = Case type
[download]

The keys in the hash are case sensitive:

According to the documentation for RT::CustomField, the $CustomField->Values part should be fine. That will return an object, but depending on the field what type of object it returns can vary. You can find out what type of object it's returning using ref($CustomField->Values). Then check the documentation for that class to find out how to get its name.