A category as proposed by @Steven J is a possibility. However, I assume "/shop" is already a subcategory of your store, and creating a sub-category has its drawbacks:
- it is not dynamic, so you always have to add new products to the brand-categories manually
- if you have multiple categories in your store, you would have to duplicate the brand categories as subcategories of each of these categories; the problem being not only the manual effort, but also a lot of SEO problems like duplicate content, for example
- if you filter for subcategories in the category "/store", you will end up with a URL like "/shop?cat=123", which is most definitely not what you wanted
Generally, the requested functionality seems to be "nice URLs for attribute filters", which is not a Magento default functionality. This is why a short Google search for "magento 1 shop by brand" brings up a lot of extensions.
I also found this module: https://yoast.com/landing-pages-module-magento/ a while ago. It allows to create CMS pages with product lists filtered by attribute. It requires some programming to work for Magento 1.9.x, but it's possible.
If programming is ok for you, there's also the option to create a module with a block-type that extends from Mage_Catalog_Block_Product_List
, which could be inserted in CMS pages like this: {{block type="mymodule/product_list_brand" brand="4"}}
, and something like this in the code:
<?php
# ... class definition and stuff
public function getLoadedProductCollection() {
return $this->getCollection()->addAttributeToFilter('brand', $this->getBrand());
}
(of course this is only a short example)
If you go a bit deeper into your requirements, maybe I can give a better answer.