You can use the ALTER NODEGROUP statement to add or drop database partitions from a nodegroup. When adding database partitions, the partitions must already be defined in the db2nodes.cfg file.
Following the use of the ALTER NODEGROUP statement, a new partitioning map is created. This new partitioning map can become the target partitioning map when using the Data Redistribution utility. (The other way to create the target partitioning map is to create it yourself.)