It is easy to find the country with the highest number of sold items with: - a GroupBy node to calculate the number of sold items by country; - then a Sorter node to sort the countries by decreasing number of sold items; - and finally a Row Filter node to extract only the first row (country) from the sorted list. The resulting country name now needs to be converted into a flow variable to overwrite a setting in the Row Filter node that extracts the data for a given country. You can do this with the Table Row to Variable node. To overwrite a configuration setting with the flow variable value you can use: - the flow variable button on the side of the configuration setting where existing - the Flow Variables tab in the configuration dialog