Not quite sure what you mean. Maybe like this?

package Foo {
    sub new { bless [] };
    
    sub msg {
        my $self = shift;
        printf "On my way to '%s'\n", @_;
    }
    
    sub Berlin {
        my $self = shift;
        $self->msg('Berlin');
        print "I'm in Berlin!\n";
    }
    
    sub Paris {
        my $self = shift;
        $self->msg('Paris');
        print "I'm in Paris!\n";
    }
};

my $obj = Foo->new;
$obj->Berlin();
[download]

Or maybe you mean like this?

package Foo {
    sub new { bless [] };
    
    sub msg {
        my $self = shift;
        printf "On my way to '%s'\n", @_;
    }
    
    sub Berlin {
        my $self = shift;
        print "I'm in Berlin!\n";
    }
    
    sub Paris {
        my $self = shift;
        print "I'm in Paris!\n";
    }
};

use Class::Method::Modifiers qw( install_modifier );

for my $city (qw/ Paris Berlin /)
{
    install_modifier "Foo", before => $city => sub {
        my $self = shift;
        $self->msg($city);
    };
}

my $obj = Foo->new;
$obj->Berlin();
[download]

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