#!/usr/bin/perl
use Data::Dumper;
my %products;
while (defined( $_ = <DATA> )){
next if $. <= 2 || /^\s*$/;
my @d = split ' ';
my $cat = shift @d;
my $id = shift @d;
push @{$products{$cat}}, [ $id, \@d ];
}
print Dumper(\%products);
__DATA__
Category ID Name Type Size
=======================================
WaterSports 8765 Drysuit r M-L
WaterSports 8365 Paddle t 45
WinterSports 5231 Snowboard j 85
WinterSports 5281 Gloves r S
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