Display nested item in menu categories module left

OK..maybe this is a stupid question but im new and try to understand.

I would like to have a menu on my left fixed module something like this (possibly in UL/LI mode):

Category main (Title)

SubCat1 (title or link )
item 1
item 2
item 3
...

SubCat2 (title or link )
item 1
item 2
item 3
...

Then when i click on item it should display in my content page links detail.

what i have only found is

Category main (link)
SubCat1 (link )
SubCat2 (link )

then all products are displayed in content page.
Is this possible in Hika Shop or do I have to make a script by myself?
Does Anyone has already a piece of code about that?
Thank you all for the answer

Rob

The categories listing module of HikaShop only displays categories.
If you want to have products that would require to make a script yourself.
The simplest could be to edit the file "listing_list" of the view "category" via the menu Display->Views in order to add a custom code to your 2 levels categories listing module in order to load the products of each sub category and display their product page link.