I'm very happy to have found Seblod, it makes Joomla so much more versatile. But at this moment I'm stuck. I'm have filtered articles with Nested exact match by category ID. This works perfectly, but now I would like to select multiple categories and show all articles for those categories (so I can have a sub set of a category level and not all categories at the same level) and all their nested categories (any words exact combined with nested match). Is there a way to do this?