Changing the default script helper base class
By default, all Functional Test scripts extend the RationalTestScript class and inherit a number of methods (such as callScript). You can create your own helper base class to extend RationalTestScript and to add methods or override the methods from RationalTestScript.
You can specify a helper base class for Test UI to use whenever you create or record a script in your project on the Project Properties Page. You can also specify a helper base class for an individual script on the Script Properties Page. After a script is created, it retains the reference to the default base class as its own helper base class.