update product quantity with csv using options as well

Hi -
Our goal is to update quantities on our OCart with our POS. The POS outputs a csv file with "Model #" and "Quantity"
I've got an extension working that imports the csv, matches the Model# and updates the quantity.

However - some of our products have options of color and size. The present extension only works with the Product table. Any ideas on how to syncronize the POS to OC using only this (albeit slim) data of the csv? Other than doing it manually...

Thank you -
Jackie