Eh? To hide an object all you do is set its visible property to false.
If I understand it right, lets say you have 10 instancest of a ball bounching around att the stage. You whant a way to hide all the ten balls at once.
In jQuery this is very easy you just make all the instances to have a css class and then select all the instances and do .hide() one the whole bonce.
There is some sort of selectChild funktionality in CreateJS. I think thats the way to go, look for an example.