This is not template specific... but;
You need to create your subcategories within your categoires
admin -> catalog -> categories/products
create your category
Then click the small folder on the left of the category name
On this screen just click the "new category" button and create your new "subcategory"
Now you can add your products.
You might want to check these articles in the tutorials/FAQ section
www.zen-cart.com/tutorials/index.php?article=56
www.zen-cart.com/tutorials/index.php?article=271
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