Product Options 0 price showing in cart

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Outline:
I have a product that's a package set of 3 items together. This package has upgrade options to add 3 new upgraded products along with the order. I added these 3 new products as separate items, with only 2 products containing characteristics for sizes. ( small, med, large,etc. )

Because the 2 add-on products have characteristics assigned to them, there is not a default for "no" like there is when you add a product without characteristics. To by pass this issue, I added one more characteristic to each new upgradable product and set the name to "no upgrade" and the price at 0 for that particular characteristic. ( So shoppers do not have to add the product to the order if they do not wish since it's an upgrade. )

Issue:
When a shopper adds the package to the cart when the upgrades are set to "no upgrade", the upgradable add-ons are added to the cart anyway, even though the price is set to 0.

Is there a way to keep these upgradable products from being added to the cart when the drop down box is set to "no upgrade" ( price 0 ) ? It would be a lot cleaner and less confusing for the customer.

Thanks in advance.

That was it!
I just had to switch that setting on and everything fell into place.

Thank you.

The products with no upgrade still show in the email sent for order conformation. ( The picture and it says 0.00 for 1 ) Is there a setting to remove this?

No, no overrides. But I just deleted the characteristics and added them back in, cleared cache and tested. The emails are working like you say now, so it's fixed.

Thanks again.