tryed threw edit >> document setup , but it changed all the pages. is ther a "page setup" or a different way?
In addition, a document "needs bleed" or it doesn't. Can you explain why your document needs *different* amounts of bleed?
Modern imposition software can cut off any excess bleed when and where necessary. However, it cannot "add" bleed where required. So more is better (although 5 mm all around usually is enough).