How can I hide free products on a category menu

-- HikaShop Business version -- : 2.5.0
-- Joomla version -- : 3.4.3
-- PHP version -- : 5.5.22

I have subscriptions with different levels:
- Level A : 50 $ (=> Group A )
- Level B : 90 $ (=> Group B )

Group B is intended to have more privileges than group A:
-- Group A
|
---- Group B

People already in Group A will pay only 90 - 50 = 40 $ to upgrade to B.

I succeeded with the ACL with prices.

My menu "Subscriptions" shows for a registered who is not in Group A or B:
- Subscription A : 50 $
- Subscription B : 90 $
which is OK.

But for those in Group A and not in Group B, it shows
- Subscription A : Free
- Subscription B : 40 $
and for those who are in Group B, it shows
- Subscription A : Free
- Subscription B : Free

I want Hikashop to hide in the category menu all products which appear as free.
Is this possible?

Hello,
The solution will just be to edit the access (using ACL) to the :
- Subscription A : Not in group A or B
- Subscription B : Group A