#!/usr/bin/perl -w
use strict;

use Text::Table;

my %data;
while (<>) {
    my ( $rep, $product, $foo ) = split ' ';
    $data{$rep}{$product} = $foo;
}

my @reps = sort keys %data;
my $table = Text::Table->new( '', @reps );

for my $i ( 0 .. $#reps ) {
    my $rep      = $reps[$i];
    my @products = sort keys %{ $data{$rep} };
    foreach (@products) {
        $table->add( $_, ('') x $i, $data{$rep}{$_} );
    }
}

print $table;
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BTW, having never used Text::Table before, I found it surprisingly powerful. Most of that power is unused on this program.