Duplicate pages

[Sheila]

Bs'd

Hi Every body!
I'm trying to make a web site... where I want the same body design in all of
them, but when I'm tryin to modify the other duplicated pages, instead of
changing just one page, it changes all the rest.

How do I make possible to modify the rest of the duplicated pages, without
modifying all of them!?

I'd really appreciate any suggestions!

Thanks in advance!

Sheila