update for prestashop

Hello. I'm running a prestashop-based online store, and I need some modification for my store. I want items to be grouped according to their categories when search result comes out. For example, let's just say there are 9 ipod-related items in my store. When trying to find items with a search word 'ipod', the result shows like the following. ipod classic (3) - 80GB (2) - 160GB (1) ipod nano (4) ipod accessory (2) And the 80GB (2) and 160GB (1) are sub categories of ipod classic (3) I guess my explanation is not hard to understand because this is commonly seen on a lot of websites, but if anything still looks unclear, please take a look at images I uploaded. I used a search keyword 'michael jackson' on 3 different websites, and the red circled is what I mean. Thank you.