Hi rygon8 and welcome to the forum,
I have a suggestion. Instead of using a Macro, how about using simple AutoFilters on your Data Tab?
Using Excel 2010, click on your Data Tab and then click anywhere in your table. Click on the Data Tab (at the top of the screen to view the Excel Icons and click on "Filter". This will put dropdowns on each of your column headings. Then click on the Category dropdown and select multiple filters. This will give you a list just like your Results Tab.
If you need a separate Results tab to show your data and can't use AutoFilters you should look at Advanced Filters using the OR condition. That would filter Categories like you discribe above. Here is a good site to show AND and OR examples.
http://www.contextures.com/xladvfilter01.html
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