I am in a process to create an interactive map which displays sales of a product by region. Based on the data shown there is a possibility that I may find similarities between a few regions and want to visualize them as a group. Something like: China : 20 Japan : 445 USA : 10 Russia : 50 UAE : 200 where the number denotes the sales count for a product.
Now as a user I see these infographics on a map and want to group all regions that have a sales count below 100 and view them as a single group. In this case it is China - USA - Russia should be grouped as Group 1 : naming it as "Regions below 100"
One option is I allow the user to have a multiselect from a list of regions and the have a button that allows the user to Group the selected items. However this shall navigate my focus from the map and I as a user would need to remember the names of the region before grouping them using the list.
Can anyone suggest a more Interactive way to group regions on the fly while I am analysing the map. Any inouts or similar example shall be helpful