Get full list of subcategories

Hello,

my title might be not clear enough but what I want to do is: When I click a parent category I get a list of subacategories in this category and I need to click again a subcat to see this category's subcategories. So I want to change this and display Subcategory's subcategories in one page. Can you please help me with this?

Cs-cart v3

eg: [url=“http://electrical.hardwarestore.com/”]http://electrical.hardwarestore.com/[/url]