A data manipulation method and system. The method includes receiving and storing by a computing system, configuration data and a first list comprising first group of data objects. The computing system generates a second list associated with the first list. The second list comprises a second group of data objects associated with the first group of data objects. The computing system compares the first group to the second group to determine if any attribute values associated with the first group are equal to any associated attribute values associated with the second group. The computing system generates a third list based on the comparing and the configuration data. The third list comprises a third group of data objects associated with the first group and of data objects. The computing system stores the third list.