Pie Chart - Part vs Others

[#1]

Could you tell me how can I create a Pie Chart selecting one value from one dimension and create an "Others" with all the others dimension's value?

Dimension: Customer

Expression: Sum(Sales)

Relative - Checked.

I want to see the % of sales for one selected customer vs the % of the others (all together).

Regards,

- Gabriel

[#2]

Thank you very much!!!