"I have a large perl project that i have split up into one main .pl file and multiple .pm files that are being referenced by the main .pl file . I wish to package everything into one file "

When you say you split up the large project, this begs the question if the large project was one file to begin with. If so, why do you want to put the pieces back into one large file again?

Why not instead do what CPAN authors do? A CPAN module is one TAR BALL. Then you use standard Perl tools to install that module. I recommend that you download Module::Starter and use it to build the skeleton framework that will house your custom Perl code and use something like Module::Build to install it.

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)