From perldoc CPAN (read it):

autobundle

  `autobundle' writes a bundle file into the `$CPAN::Config-
  >{cpan_home}/Bundle' directory. The file contains a list of all
  modules that are both available from CPAN and currently
  installed within @INC. The name of the bundle file is based on
  the current date and a counter.
[download]

You can invoke it by saying:

>perl -MCPAN -e autobundle
[download]

It then starts to print out all the modules on your system, and put them into a bundle file:

CPAN: LWP::UserAgent loaded ok

    [... bla bla bla ...]

Package namespace         installed    latest  in CPAN file
AnyDBM_File                   undef     undef  G/GS/GSAR/perl-5.6.1.ta
+r.gz

    [... many such lines ...]

uri                            1.04     undef  L/LD/LDACHARY/URIC-2.02
+.tar.gz
vars                          undef     undef  G/GS/GSAR/perl-5.6.1.ta
+r.gz

Wrote bundle file
    D:\home\.cpan\Bundle\Snapshot_2001_07_30_00.pm
[download]

Now you have a bundle file that you can edit to your needs. Note that the order of appearance of modules matters, so you might need to tune your bundle file to your needs. That's how the bundle file autobundle created looks like:

package Bundle::Snapshot_2001_07_30_00;

$VERSION = '0.01';

1;

__END__

=head1 NAME

Bundle::Snapshot_2001_07_30_00 - Snapshot of installation on  on Mon J
+ul 30 10:11:15 2001

=head1 SYNOPSIS

perl -MCPAN -e 'install Bundle::Snapshot_2001_07_30_00'

=head1 CONTENTS

AnyDBM_File undef

AppConfig 1.52

    [... many such lines ...]
    [... NOTE: these are the lines you want to edit ...]

subs undef

uri 1.04

vars undef


=head1 CONFIGURATION

    [... bla bla bla ...]

=head1 AUTHOR

This Bundle has been generated automatically by the autobundle routine
+ in CPAN.pm.
[download]

Christian Lemburg
Brainbench MVP for Perl
http://www.brainbench.com