1. create a data object BaseClass in a project through decision central. create a method, for exampe, baseClassMethod, in this data object. 2. create another data object ChildClass and set its super class as the BaseClass created in step #1, create a method, for example, childClassMethod, in this data object. 3. add a guided decision table a. under Columns, click Insert Column. select "Add a Condition". The 2nd step is "Pattern". select the ChildClass created in step 2. Then follow the wizard to complete the process to add a condition column. b. again under Columns, click Insert Column c. check "Include advanced options". and select "Add an Action BRL fragment" d. in the step of "Rule Modeller". click the "+" at the right of the "THEN" e. select "Call method on ChildClass". ok f. it shows "Call ChildClass" under "THEN". click on the little green "->" g. open the drop down list "choose a method to invoke". you should only see the method "childClassMethod" created in step #2. The method "baseClassMethod" created in the BaseClass is expected to be available here but it's not.