Advancing monster rules?

[Voadam]

From the previews of creatures from the WotC site I don't see entries for advancing monsters.

Are there rules for this?

Where are they found?

What are they like?

Are they simple to use in practice?

 

[Mort_Q]

From the previews of creatures from the WotC site I don't see entries for advancing monsters.

Customizing Monsters (04/18/2008)

 

[Scribble]

They're so easy it seems like advancing a monster on the fly in the middle of a game won't be hard... crazy huh?

 

[Voadam]

Customizing Monsters (04/18/2008)

Thanks a bunch!