You can create a group to combine related members in a field. For example, if you are working with a view that shows average visit by location, you might want to group certain cities together to create location categories. State and City might be combined into a group called Location.

Groups are useful for both correcting data errors (e.g., combining CA, Calif., and California into one data point) as well as answering “what if” type questions (e.g., “What if we combined the East and West regions?).