I might be misinterpretting, but sounds to me like you need to use the perl 'use' function. Typically, you would put code you want to 'include' into a perl module, and then in the script in which you want to 'use' that module, you would do something like:

   use My_Module;
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Doing

   perldoc perl
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and looking for 'module' shows these perldocs are available:

           perlmod             Perl modules: how they work
           perlmodlib          Perl modules: how to write and use
           perlmodstyle        Perl modules: how to write modules with
+ style
           perlmodinstall      Perl modules: how to install from CPAN
           perlnewmod          Perl modules: preparing a new module fo
+r distribution
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My guess is you want the 'perlmodlib' - how to write and use perl modules. So, at a command prompt, do

   perldoc perlmodlib
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HTH.