I am not sure if this is even possible...

I have a model in which I would like to scale it down to be able to 3d print a miniature version of.

The actual assembly is 8ft tall and 4ft wide. I would like it to scale it down for a desk top version of the full assembly. But instead of going to each individual part and saving it off with a new name to then remodel it in its smaller version. Is there a way i could scale it down automatically to save myself hours of work...?