Sell products in order of 6 - beer shop solution for prestashop

I wanted to know if the module will allow me to implement a fairly specific restriction The users can only order products in order of 6 (is a beer shop) So for example: Is not allowed to: Buy 1 A beer (Total 1) Buy 7 A beers (Total 7) Buy 6 A beers and 5 B beers (Total 11) But it is allowed to: Buy 6 A beers (Total 6) Buy 2 A beers and 4 B beers (Total 6) Buy 1 A beer, 1 B beer, 2 C beers and 2 D beers (Total 6) Buy 6 A beers, 3 B beers B, 2 C beers and 1 D beer (Total 12 => 12%6=0)

Hello,
As i suppose you reffer to "cart conditions pro" module or to "minimal product quantity"
Both modules allows to achieve what you expect, but there are some differencies that requires explanation.

• Minimal product quantity
  • this module is applicable to products only. This means that you can set rule like:
    
    • Customer must purchase at least 6 quantity of selected item, module will accept only multiplied quantity for this item (6,12,18 etc)
      For example - it is possible to achieve: Customer must purchase 6qty of "Carlsberg" beer.
      For example - it is not possible to achieve: Customer must purchase 6qty of several different beers (2xCarlsber, 3xHeineken, 1xGuiness = 6 qty of various beers)
      
      As you can see - module is applicable to products only. It does not allow to combine quantities of several items.
      
• Cart conditions pro - this is the module you are looking for
  • this module can be applicable to products individually and also to products from selected categories. For example to products from category "beers". his means that you can set rule like:
    
    • Customer must purchase at least 6 quantity of items from selected category - in this case "beers", module will accept only multiplied quantity of sum of these items (6,12,18 etc)
      • For example - it is possible to achieve: Customer must purchase 6qty of "Carlsberg" beer.
      • For example - it is possible to achieve: Customer must purchase 6qty of several different beers (2xCarlsber, 3xHeineken, 1xGuiness = 6 qty of various beers)
      • For example - it is possible to achieve: Customer must purchase 6qty of several different beers (4xCarlsber, 3xHeineken, 5xGuiness = 12 qty of various beers)
      • For example - it is possible to achieve: Customer must purchase 6qty of several different beers (5xCarlsber, 7xHeineken, 6xGuiness = 18 qty of various beers)
      • For example - it is possible to achieve: Customer must purchase 6qty of several different beers (10xCarlsber, 12xHeineken, 4xGuiness = 24 qty of various beers)
        

So, if your products are in category "Beers", you can set up a rule for this category that will accept 6 qty of various items and only multiplied values of this quantity (6,12,18,24,30 and so on).
You can setup the same rule for products from selected manufacturer (for example "heineken" brand).

Screenshot for reference:
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best regards