mat.pl
--------------
use lib "lib";
use Utility;
use Add;
use Group;

Add::Add_Acct();

##</code><code>##

lib/Add.pm
--------------
package Add;
### I tryed exporter here with no luck, maybe I did it wrong? ###

require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw($USERID);

sub Add_Acct
{
   print "Adding an Account";
   &ID;
   &LAST ;       
   &FIRST;       ##a prior dev did this sub calling, its crap I know ###
   &USERID;        ##This sub takes user input ##
   print "ID: $ID - UserID: $USERID \n";  ## All vars defined and as expected here ##
   Group::Groups();
   ....
   ...

##</code><code>##

lib/Group.pm
-------------------
package Group;
sub Groups
{
   print "ID: $ID - USERID: $USERID \n";
   ### $ID is ok but $USERID is undefined ##
   .... 
   .....
}

##</code><code>##

sub USERID
{
   $USERID = Utility::Single_Input('Input Account Name', $USERID, $REQUIRED);
   print "UserInput entered is $USERID \n";
}