Display subcategory entries when parent category is selected.

Hello,

I am trying to get entries placed in a subcategory to be shown when a
visitor views a top-level category.  So, for example, if a user clicked
on a link for the Category /Sports, they would see all posts with that
category, along with posts in /Sports/Football, /Sports/Baseball, etc.  
Is something like this possible?

Thanks,
Eric Schmidt