Hi Wei,
For that you need to create a list called NewList which you want to delete, Itererate the list of objects which you have retrieved earlier, then use a find by expression activity In that perform $iteratorObject/Note = $currentObject/Note then add a decision after the list then check FindObject != empty, if the object is empty add to NewList else Add Delete activity to delete the iterater object.
Hello Wei Jie Sow,
Create a 2list called Object1 and Object2, and in Iteration loop check the condition met or not.
if Condition met add to Object1 and In 2nd Iteration check Id is store in object1 or not if you find same id add that in Object2.
After loop delete Object2.