If you set your @INC correctly, you should be able to put your modules in any directory inside of it. Do this for me:

someuser@somebox:~$ perl
foreach $entry (@INC) {
   print "$entry \n";
}
/usr/lib/perl5/5.6.1/i686-linux 
/usr/lib/perl5/5.6.1 
/usr/lib/perl5/site_perl/5.6.1/i686-linux 
/usr/lib/perl5/site_perl/5.6.1 
/usr/lib/perl5/site_perl 
.
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This is a list of easy to use places you should be able to stick a .pm file. For kicks lets use
/usr/lib/perl5/site_perl/5.6.1/i686-linux Place your whatever.pm files in that directory. Then withing your perl file simply place

#!/usr/bin/perl -T

use whatever; #that pre .pm name of the file you used
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This will then scope your functions that you need to your current namespace. Have fun. Also read up on packaging to add another layer of power :). BTW mediators, if I am off a little on my logic, take it easy on me, is late :).
Tradez
"Never underestimate the predicability of stupidity"
- Bullet Tooth Tony, Snatch (2001)