Cloning

[desktopsimmer]

I'm working on a project at the moment that has literally hundreds of the same object, but in different orientations. Is there a way to easily clone a object so that I only have to modify one and it gets replicated across the rest?

So far, the 'best' workaround is to use 'Select Similar' and hope if doesn't select something that I don't want to modify. however some of the edits I have to make are not easily modifiable this way.