perl hash in hash problem

Hi! all

 I have a hash in perl which looks like this

my $col_selection = {
               disp      => "color",
               value     => 1, 
               req => 1,
               props     => {
                              type => 'select',
                              vals => {
                                        1 => 'Red',
                                        2 => 'green',
                                        3 => 'blue',
                                      }
                            }
             };

 What i want is that values for vals should be read
form a config file. I have made a config file and able
to get values form it.
 Npw my problem is how do i refer to vals in the code
to create the hash.
I have tried following but no luck

$col_selection->props->vals = ($key, $value);

 Aforesaid was a fluke which has not worked. Can any
one point me how to refer vals in this kind of hash!!

Regards
VK

=====
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