$ cat Foo.pm
package Foo;

use strict;
use warnings;
use Exporter;
our @EXPORT = qw( this_method that_method );
our %EXPORT_TAGS = ( all => [qw( this_method that_method )] );

sub this_method_that_method { "Hello World" }

1;

$ cat a.pl
use strict;
use warnings;

use Foo;

print this_method_that_method(), "\n";

$ perl a.pl
Undefined subroutine &main::this_method_that_method called at a.pl line 6.