Loading attachments to collections

Hello,

We are looking for a way to upload attachmets to a collection via script.  For example, we have a csv file set up like this:

Class,Object,Collection,CertAgency,CertAttachment

masterdata.Vendor,Vendor1,Certificates,Insurance Agency, ProofOfInsurance.pdf

We'd like to have a script that adds a row to the Certificates collection on Vendor1 to show 'Insurance Agency' as the CertAgency, and attach the ProofOfInsurance.pdf file in the CertAttachment attachment field for that line.

Has anybody had experience doing this?

Thanks in advance,

Phil