Disabling and reactivating VST instruments in Cubase Pro 8

How can I disable and reactivate my big orchestral VST instruments in Cubase Pro 8 ?

My goal is to create a massive orchestral template from which I can choose as many instruments I want to use. My computer couldn’t handle hundreds of VST instruments so that’s why I’m asking.

It would be easier to create new songs if I just could have my all VST instruments available when needed.