I'd like to have my category archive (category.php) accessible using via a url structure like:

mysite/mycategory/mysubcategory

For example, I've got "health" as a category and "smoking" as its subcategory. The following:

• mysite/health
• mysite/smoking
• (and even) mysite/category/health/smoking

all work fine.

But mysite/health/smoking gets a 404.

Is there something under Settings->Permalinks that will fix this? Do I need to put a rewrite rule of some kind in functions.php?

Thanks.