list only All product of sub category

-- HikaShop version -- : 2.4
-- Joomla version -- : 2.5.28
-- PHP version -- : 5.5.8
-- Browser(s) name and version -- : many

Hi
I don't succeed to select /see all product listing of specific sub categories of name c ( and also implicitly d e,f ) . I understand i have to modify the associated modules to custom the html page in client side but all product appear instead only the one which have the category i want to show
Any help for this rather basic problem ?

Hi
Is there a way to do that by using a mix of custom fields instead category hirearchy ? .

I create many products that use custom fields ie a b c wit hmany value a1 a2 b1 c1 .

A) Is there a way to create a link to only for a subset value / field of products ? .
for example i only want to see All the products that have a=a1 b=b2 c any value ?

If thisl ink return too many products ; does HKS create an index to others page when item is iover an predefine value /page ?
for example << < 1 2 3 > >> ( 123 or alphabet item )

C) can we custom the html code for this specific link ?
wich BE step let us overide html structure mix with css selector ?
does this file is create dynamicly when use BE ?

Regard's