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Storage variable

Hello, I have a question about setting local storage variables. I have pretty much everything working, except what seems like it should be easy. My example is as follows:

In my database I have materials under a category "Building Materials" and then several sub categories. If I set variable building materials, and then set variable stainless steel it will indeed show all stainless steel items.

My issue is how do I show any and all things under building materials, regardless of what the sub categories are?
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