Removes members of the collection which are also members of another collection and returns the results as a new collection.
object expression.Subtract (Object)
object expression Required. An object expression that evaluates to an object in the Applies To list.
Object Required. Either a Group or Region object.
The following example creates a new Group object which consists of Bot objects which are in GroupA but not in GroupB.
Set NewGroup = GroupA.Subtract (GroupB)