OK, I think I see what you are saying. So essentially, my Base class does the following when the "do" method is called on it:

package Base;

use One;
use Two;
use Three;

sub do {
  print "hi from Base\n";
  Three::do;
  Two::do;
  One::do;
}
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And my config file would determine which order to run the subroutines from each of the packages. Is that right?

UPDATE: Here is a version of the code above that is a bit more dynamic:

package Base ;

use One;
use Two;
use Three;

sub new {
  my $class = shift;
  bless { steps => [ qw(Three Two One) ] }, $class;
}

sub do {
  my $s = shift;
  print "hi from Base\n";
  for my $step ( @{ $s->{steps} }  ) {
    $step->do;
  }
}
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So I think I got it from here. I just have to dynamically import the correct modules and populate the steps attribute with the config file during construction. Nice trick. Thanks!