Hi,
This can be done in many different ways. For example, you can build a client or integration that does this using our APIs, but I think you want something that is as simple as possible.
The simplest way can think of that does not require that much work would be something like this:
1. Arrange things such that all files has the inventory part number somewhere in the file name
2. Import all files in the File Import screen.
3. Write a SQL script that loops over all the newly imported documents, extracting the inventory part number and connecting the document to the right part. Perhaps also clear the inventory part number from the document title now.
It takes some knowledge in SQL, PL/SQL and IFS' data model, of course, and access to the database from SQL*Plus or a similar tool.
Or, now that I think of it, perhaps a custom event can do it too. As each new document is imported, a custom event could trigger, doing what the script above would do (connecting the document to a part).
Good luck!
/Mathias