When creating a map chart is it possible to aggregate regions? For example, suppose I wanted to view East Anglia on a UK map, which is a region comprising of the counties of Norfolk, Suffolk, Essex and Cambridgeshire. The four counties all have individual region codes (GB-NFK, GB-SFK, GB-ESS and GB-CAM) but there is no code for the wider region of East Anglia - can we merge the counties on a map chart, so that they are viewed together and the chart displays data for the region as a whole?
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