Put an eval like this before the transform command that gives you the Sales by Country:
eval Country = case(Country=="A","A",Country=="B","B",Country=="C","C",Country=="D","D",Country=="E","E",true(),"Others")
for example:
index="myindex"
| eval Country = case(Country=="A","A",Country=="B","B",Country=="C","C",Country=="D","D",Country=="E","E",true(),"Others")
| stats count as Sales by Country
| eventstats sum(Sales) as TotalSales
| eval Percentage = Sales / TotalSales
... View more