If you'd like to consider a 3rd party tool we have a Lotus Notes / Domino Import utility that enables you to import data from:
* CSV (Comma delimited)
* Other character delimited files
When importing data it can create new records or update existing records based on a specified key field / value. It handles all types of data including multi-value.
For more information and to download a copy of it:
Single user license costs less than an hour of your time.