Presumably you are referring to the manufacturer's product ref. and not your website product code. Its possible, but its going to require some hefty perl script programming.
There is something in one of the manuals about creating your own special searches. It is intended for adding special fields to the Advanced Search. The .cat files have a REFERENCE item in them - I guess this is the Product Reference
we use the manufacturers product code in the product reference field
Presumably this is the Actinic product reference field and you are using the manufacter's code instead of an auto-generated numeric code.
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