I'm working on a blog that will have a few parent categories, and each parent category will have dozens, maybe hundreds of child categories. I need a way for the categories list to only show the parent categories. If you clicked on a parent category (and/or) visited the parent category page), you would see the child categories for that parent category.
So, for example, the category list on the homepage would be:
If you clicked on Cat 2, you would then see:
How can I do this?
Thanks for the help!