with  
set Product as [Nomenclatures].[Palma].[Description].members

set setA as TOPPERCENT(Product,  60 , ([Measures].[Продано, грн]))
set setAB as TOPPERCENT(Product,  90 , ([Measures].[Продано, грн]))
set setB as setAB - setA
set setC as Product - setAB

member [measures].[ABC по продажам]
as
Iif([Move].[Transaction].CurrentMember is [Move].[Transaction].[Продано],
Iif([Nomenclatures].[Palma].CurrentMember.Level is [Nomenclatures].[Palma].[Description], 
Iif([Measures].[Продано, грн] <>  0 ,
iif(Rank([Nomenclatures].[Palma].CurrentMember, setA)> 0 , "A",
    Iif(Rank([Nomenclatures].[Palma].CurrentMember, setB)> 0 , "B", "C")),Null), Null),Null)

select non empty {[Nomenclatures].[Palma].[Description].members} on  1 ,
       {[measures].[ABC по продажам], 
        [measures].[Продано, грн]
        } on  0 
from [Транзакции и Остатки]
where [Products].[Palma].[Group].[Продукты питания].[Какао]