@RaghavN2

You can use an 'Update a case' shape to move the parent case to an alternate stage where it resolves to Resolved-Cancelled and 'Resolve open child cases' checkbox is checked in the stage.

@RaghavN2 

It can be achieved by using activity but Activities are not recommended by Pega.

In update case shape  select single case and give.pxCoverInsKey in withID parameter which  will refer to parent case and write a own DT and  Refer call OOTB Activity (pxForcecaseclose) using function to call activity in DT and pass parameters Parent WO ID ,WorkStatus  this will close all the cases and it subcases.

Refer to OOTB pxForcecaseclose Activity.

@RaghavN2

 Approach 1 :

Call update status shape and select single case then Configure your update shape as follows. .pxCoverInsKey will refer to parent case.

 Approach 1:

Refer DT  Step 1 : Param.inskey = pyWorkCover.pxCoverInsKey

         Step2:   Call OOTB pxForcecaseclose activity as pass the required params

Function to call activity in Data transform @Utilities.pxExecuteAnActivity(myStepPage, "pxForcecaseclose")

Other Approach :

In Data transform Call pxChangeStage activity and pass Stage name as a parameter and in Alternate Stage -Select Resolve the case,case status and select Delete open assignments/Resolve open child cases.

Function to call activity in Data transform @Utilities.pxExecuteAnActivity(myStepPage, "pxChangeStage ")

Thanks,

Vikram