You want to create a module. You'll probably want to read perlmod first. Here's a very basic example to get you started (untested):
############################
# filename: MyFirstModule.pm
package MyFirstModule;
our %common_codes_hash = (
'000001' => 'ITEM _First',
'000002' => 'Item B',
'000003' => 'House',
# ....);
1;
__END__
########################
# filename: myscript1.pl
use MyFirstModule;
my $whatever = $MyFirstModule::common_codes_hash{$foo};
# ....
__END__
Later, you can get fancy by using Exporter to export your common data structures or functions into the script's namespace, and other things.
Update: changed the my to our (realized the error at the same time as snowcrash).
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