How Do I Setup Sub-Category Pages?

I have my permalink settings for my links as so:

https://example.com/category/example

where my file would be “category-example.php”

..but how do I setup/manipulate the file for:

https://example.com/category/example/subcategory

but for different subcategories like so:

https://example.com/category/example/subcategory1

https://example.com/category/example/subcategory2

..etc…?