How to exclude "Sold: NET" items from Quantity discount module

I have around 400 items that are sold as NET out of 8000 and would like to find a convenient way to exclude them from quantity discount.
Under v_products_description_1, I have items described as this; Country Fishing<br/>Size: Mural<br/>Pieces: 1<br/>Sold: Net<br/>Crystal: 0<br/>Dimensions: 18" x 14"
and would like to exclude these from the discount.

I assume you're talking about my Quantity Discounts module from the plugins section, not the native Quantity Discounting feature, accessed through the Products Price Manager, right?

If so, you'll need to customize the function exclude_product. Retrieve the description and search for the string you're using ("Sold: Net").

Yes, your Quantity discount mod works wonders.

Just need to know how exactly would I "Retrive" the description and search for the string?
I am assuming in include/modules/order_total.php?

Correct.
Look in the FAQ - I posted an example of how to do this.
http://www.thatsoftwareguy.com/zencart_quantity_discounts.html#faq