for us containment is like putting something in a container to lock it away for some time.
we would never do that with a part.
we do raise dissociative barriers though. that is more like going into the next room and closing the door to get a break. lowering the amount of co-consciousness doesn't feel like containment.
when doing this it would be best if someone inside could actually take care of the parts who might be struggling. just throwing all the needs at one part who is too troubled to support them is not going to meet anyones needs. it makes that part want to withdraw even more, then the other pull even more, and the result will be major dissociation to reduce the field of consciousness, including that for the inner experience. host goes numb and into shutdown.
so it would be wise to negotiate a break or generally situations when someone might need a break from the others and turn responsibilities for inside action to someone else. at least for us it helps when we signal that this is a break situation so everyone knows to leave me alone for a while. they know I will just spin out of control if they keep pushing. I am not sure if this works for every system though.