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package MyParent;
use strict;
...
sub parent_nifty_method2 {
   ... pah ...
}

package MyParent::MyChild;
use strict;
...
sub child_method_b {
   ... incredibly cool stuff ...
}

script_to_change_the_world.pl

...
$parentobject->child_method_a;
#Prints: Foo

Can't locate object method "child_method_a" via package "MyParent" at 
+script_to_change_the_world.pl line 14.