Try this. 
#!/usr/bin/perl

use strict;
use Data::Dumper;

my %record;
while (<DATA>) {
    next if ( /^Employee/ );
    my ($employee, $form, $date) = split( /\s+/ );
    $record{$employee}->{$form} = $date;
}

print Dumper \%record;

__DATA__
Employee  Form   Date
10001      10    20090101
10002      10    20080515
10003      10    20090323
10001      20    20090412
10002      20    20090711

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In reply to Re: Data Structure Question by bichonfrise74
in thread Data Structure Question by bohrme

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