Here's some information I had compiled previously:
Here's Steve Malmgren's Upselling BOI scripting demo (starts at 26:20):
http://sage.edgeboss.net/wmedia/sage/mas/sales/v44customizer.wvx
I originally saw this demo in Jan '10, which included this ""Upsell function in S/O where based on the item entered, it then brings in several other items to offer to the customer"".
And I believe the attached UDSDemo .m4x file contains the CO stuff related to his demo (which looks like it may be the same file that @AmberPrayfrock posted).
Also attached is 'Summit2011_BOI.zip' (which I previously obtained via SC) that contains various files/info and therefore may be of value.
And this SC thread (https://90minds-com.socialcast.com/messages/16063622) talks about different options (e.g., BOI Script, BOM with Options, Kits, DSD SO-1479).