Thanks for your solution. Curious - since I have the product results page (the general one) setup how I want it. Couldn't I just create a duplicate of this page, and then modify the code to include those OR categories? Could you tell me the steps to MODIFY the product results page to only show those categories I want? Or is that page already too different from what I want, and it's easier to start with a fresh page.
Reason I ask is because I'm a little confused with the second/last part of your steps (highlight bindings and add them to the page).