Showing Multiple Categories At Once
Is there a way to show multiple categories at once? For instance - I have two main groups of products - each with 3 categories. I want to be able to click on one group, have it show all three categories of products at once - but also have the 3 categories as links on the top (to avoid having them have to choose a category before seeing any products). Is this possible? What would be the URL syntax (if that's how I would do it)? I've tried various ways of adding other category numbers to the URL but none seem to work.