How to organize products by sub-category within the main category view ?

[USB83]

Hello,

I'm looking for a way to group products by sub-categories when a visitor is viewing a main category.

For example let's say i'm in the smartphone category.

Inside this, there are several sub-categories (Android, Iphone, Windows Phone, Palm etc..), so i would like the products to be grouped by sub-categories, iphone together, windows phones together etc..

This layout i did helps show what i'm looking for

 

Edited September 19, 2019 by USB83
added ps version (see edit history)