Dynamic Top N and Others

[vaibhav_osc]

I have a problem with implementing a donut showing top N and Others groups for a measure. My underlying dimension data is of below type:

Product	Group
1	A
2	A
3	A
4	B
5	B
6	B
7	C
8	C
9	C
10	C

It has a measure connected on Product column. I need to get the top N [Group] as shown below where the blue segment is "Others" group. 

The problem is with naming the "Others" as when I am doing it in another calculated column, it is static and doesn't work well when any filters are applied on the report. Is there any way to make it responsive to filters, so that respective Top N [Group] are shown for different selection ?