Please excuse duplication to multiple lists.

Thank you to all for your help and suggestions!  Here's a summation of the solutions and suggestions for further inquiry that I've received so far:

1. This suggestion from Ross Whitley at the University of Essex Library uses text based access to III (i.e. PuTTY) and would probably work best for sets of records smaller than 5,000 at most:
Create a list from a file of IDs – barcodes, record numbers, OCLC numbers, etc by creating a list of keystrokes which you can copy and paste to create a long search argument. 

Keystrokes to search for bib record .b12345672 would be
09=.b12345672 [return]
To add a second line to the argument, to search for bib record .b17654324, I would then key
o09=.b17654324 [return]

A search in INNOPAC can contain a maximum of 99 lines of searches, so the way to construct a search would be:
Once finished, you can use INNOPAC to manipulate your list, or you can move to Create Lists in Millennium and manipulate/export from there.

2.  This option from Ryan Finnerty of the UC San Diego Library uses Data Exchange in Millennium and would work for large files.  The only caveat is that it requires a special load table.
[Turn] the file of bib numbers into MARC records using MarcEdit, load the records in Data Exchange by matching on bib# AND using a special load table that protects all existing data and strips all incoming data. Check off use review files when loading and when done copy your load file into an actual review file in Create Lists. If you don't have edit/create access to your load tables then you'd need to ask III to do make that table for you.

3.  Lastly, it was brought to my attention that there was an IUG session on the subject presented by Kathleen Botter, Systems Librarian at Concordia University.  It was titled "Turning a Collection of Physical Items or Electronic List into Create Lists -- IUG Clearinghouse Script Redux."

Thanks again to all! This will make life much easier.

Chris

__________________________________________
Christine W. Blackman
Catalog Librarian
Williams College Libraries
Williamstown, MA
413-597-4403
cblackma@williams.edu

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