Product filtration

I can’t figure out how to make products sort themselves dependent on the product choosen before.
If you look at my attached pictures, in ‘Picture 1’ there are a great number of motherboards to choose from because i haven’t selected any CPU in step 1.

Look at ‘Picture 2’- After I have choosen af CPU the plugin sorts out what motherboards it works with.

You can try it out by following this link: http://new2new.com/?item=woocommerce-product-builder

How can I make this work?

Thanks