Shipping issue: Product is virtual, but attribute gives option for hardware

Zen cart: 1.3.8a
Shipping module: Advanced shipper

We sell "online training" which doesn't have a shipping cost. However, they have the option of choosing a "hardware" bundle in case they need it. I added this option by adding an "attribute" to the "online training" product. The problem is, I set the online training to be "free shipping", however, now if they add the option of hardware it's also free.

What should I do to handle this?

Nevermind. Figured it out.

Using Advanced shipper, I didn't realize I could go down to even the attributes. So I set that specific attribute to a specific method that I called "Free shipping for training". Then I set the price table to <weight>0:0, 1:0</weight> just to make sure it would be 0. And it works now.