KEVIN ZEMBOWER a écrit :
My ultimate goal is to import them into Koha to manage the collection.

good goal ;-)

Can anyone help me out with a way of doing this efficiently? Thanks for your 
advice and suggestions.

You should do this in 2 steps :
        my $newRecord = MARC::Record->new(); # 1st to create the record
        $newField = MARC::Field->new( # 2nd to create the field
                '011','','',
                'a' => $resul{ISSN},
        );
        # to happend the record to the field.
        $newRecord->insert_fields_ordered($newField);

If you have empty values, just say 'a' => "".$resul{ISSN}

(Perl dislike a lot hashes with empty values)

when you will bulkmarcimport your biblio in Koha, empty subfields will be ignored, so don't bother ;-)

HTH
--
Paul POULAIN
Consultant indépendant en logiciels libres
responsable francophone de koha (SIGB libre http://www.koha-fr.org)

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