Looking for Batch Process substituting/replacing one reference file attachment for a different file.

I am looking for a way to Batch Process substituting/replacing one reference file attachment for a different file. It would be similar to double clicking the Reference and Browsing to a new file. Haven't been able to find any key-in for this action.

I would like to identify a current attachment and redirect it to a different file. I browsed the newsgroups and could not find a solution.

I don't want to detach the reference and attach a new reference because it would loose it's slot # and level display settings. 

Anyone have a solution? Any help would be appreciated! I have hundreds of files to do. Thanks to all (in advance)!