SSRS filter TOP N with others
===

I have a datase with man rows and couple groups/subgroups. Child group can have many records and i need to show only 5 first and others have to be in row "Other".  
I managed to filter group like this:

    Expression: Product
    Operator: Top N
    Value: 5

But now other rows are not visible. Maybe somebody had the same problem or jus simply knows how to solve it? My matrix looks like this:

    +--------------------+-------------------------+
    |                    | Date                    |
    +                    +----------+--------------+
    |                    | Quantity | All Quantity |
    +----------+---------+----------+--------------+
    | Employee | Total   |          |              |
    +          +---------+----------+--------------+
    |          | Product |          |              |
    +----------+---------+----------+--------------+
Employee is a group, Product is child group. Date is column group.