Discount prices on few articles

I've installed the free download version of Hikashop and I want to add discount to a few products only or a whole category. I can't find how to do that.
Is it possible to do this or not ? And if it is, is it possible in a bought version of Hikasop ?
Thanks in advance.

It's only possible in commercial editions via the menu System>Discounts. In the free version, you can add discounts but it applies to the whole store.

As well in the Essential as in the Business version ?

Yes, both editions.