Changing the default script helper superclass
By default, all Functional Test scripts extend the RationalTestScript class, and thereby inherit a number of methods (such as callScript). Advanced users may want to create their own helper superclass which extends RationalTestScript and can add additional methods or override the methods from RationalTestScript.
You can specify a helper superclass that IBM® DevOps Test UI (Test UI) will use whenever you create or record a script in your project. This default superclass is specified in the Functional Test Project Properties page. You can also specify a helper superclass for an individual script in the Functional Test Script Properties Page. Once a script has been created, it retains the reference to the default superclass as its own helper superclass.