Sure its, possible, but its also a bad idea :)

Any shoe, here is how (first one is "better" than 2nd, the rest are supporting tutorials)

Tutorials: Modules: How to Create, Install, and Use: Using Modules: Including files

Tutorials: Modules: How to Create, Install, and Use: Creating and Distributing Modules: Simple Module Tutorial

Tutorials: Getting Deeper Into Perl: Variable Scoping in Perl: the basics

Tutorials: Getting Deeper Into Perl: Coping with Scoping