I created a map that shows the revenue from different US states and regions in Canada. I have selected multiple states and grouped them together to present a region. I'd like to now show the total revenue for the whole group?
Check out this thread: Sum of a group of counties. Although it is dealing with counties and you are asking about states, I think you are asking a very similar question. I presented 3 different options, perhaps one will work for you or spark an idea!