I've a label (which is a bunch of text and image objects) that's been tiled across a sheet manually. Is it possible to edit one copy of the label and have the changes apply to the rest of the copies? I've seen it done in CS5 by double clicking until it reaches a text layer/object but CS4 doesn't seem to behave the same way with double clicks.
There are two ways this could have been done that you saw:
Using symbols (best for irregular placement)
Using the 'Transform' effect,
It's also possible it was a blend you saw, but they're a bit different - there's two (or more) objects and it fades from one to the other, so double-clicking into one edits that side of the blend.
Either way, you'll need to re-do the tiling, but you'll then be able to re-create it such that editing one edits all of them.
Both have loads of additional options and potential, so play around with them and get to know them. Mulitple Transform effects with rotation and scaling can get really crazy :)
The only way to do this without having previously set it up so that Illustrator knows that the objects are linked is to use something like the
Illustrator can't read minds - if you copy an object the normal way, it treats the copies as simply new shapes. It doesn't know to link them back to the original unless you tell it that these copeis are somehow linked back to the original (e.g. by using symbols or effects that create copies dynamically on the fly).