[Koha] CDS/ISIS to MARC21 (Koha) issue

[Alexandru Constantin]

Dear colleagues,

I'm trying to convert (using MARCEdit) my approx. 10 000 entry ISIS
database to MARC21 for import in Koha.
I'm encountering the following problem:

Some of the tags for each book are duplicate; for example, for multiple
authors, the record will look smth like this:
...
=702  John
=702  Mary
=702  Ann
...

I would like to merge this fields into the MARC21 100 field like this:
...
=100 \\$a John, Mary, Ann
...

Unique fields haven't posed problems, but those duplicates do.
I would really appreciate some help.

Best regards ^_^,

-- 

Alexandru Constantin
Student
Computer Science @ University Politehnica of Bucharest

http://crasheralex.me