Link a document to others type document with object-link

Hi to all.

Working in DMS module i have a document Type (JFF) wich must be linked to servarl documents (all the same document type but different from first one, for example CJL). The relationship is that all CJL with a supplier must be linked with one JFF with the same supplier, i mean there´s going to be a relation 1 JFF -- N CJL.

Then when i submit the CJL the link between this document and the document JFF with the same supplier must be created, but i don´t know where or how i might begin.

Thanks in advance.