Fist of all, I am not sure exactly what you are trying to do, so here is an answer with my best guess at what you are wanting to achieve.

You really need to read perlref. If you are using a *NIX server, from the command line type;

perldoc perlref
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And study away. Now to my "solution";

#!/usr/bin/env perl

use strict; use warnings;
use Data::Dumper;

my $arr;

push @{$arr->{car}}, ( 4,3,2,1 );
print Dumper $arr;
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Some explaination; The $arr->{car} is a reference to a hash where the key is the string "car". The @{ } says to treat the value of the hash as an array. And you know what push does. perlref will be explain it completely.