I want my url to look like this: www.mysite.com/shop/category/subcategory/produc

Hi,

Go to your Joomla menu manager.
Create a menu item with the alias "shop" without any parent menu item and configure it to display the main categories of your shop.
Create a menu item with the alias "tables" with the "shop" menu item as parent menu and configure it to display the categories under the "tables" category.
Create a menu item with the alias "small_tables" with the "tables" menu item as parent menu and configure it to display the categories under the "small tables" category.
Create a product with the alias "white_small_table" under the small tables category.
Finally, under the Features tab of the HikaShop configuration, turn on the "remove category and product id from URLs" setting, and empty the setting "Product SEF name".
You should then get the URL www.mysite.com/shop/tables/small_tables/white_small_table when trying to access the white small table product from these menu items.