You can create a subset of a data set to create smaller chunks of test data that are referentially intact.
A related data set is a subset of a data set. Create a related data set that contains specific data from another data set. For example, you create a data set DA_APP when you test version 1.0 of an application for a specific customer. You test specific features of the application in this release. The data set DA_APP contains tables relevant to the tests you run. When you test the next hotfix version of the application, you test a few of the features and you require some of the data in the data set.
Create a subset of the data set that includes the required data. Create an entity or group in the data set that includes the tables that you want to include in the subset. Run a plan that includes the entity or group to create the subset data set.