What are you shooting with? What preset do you want to use? HDV?
AVCHD? There is a preset under AVCHD that is 1920 by 10
80 at 30fps.
Welcome to the forum.
If you cannot find a Preset that matches your footage exactly, you can choose a Desktop Preset, and then in the settings screen, adjust almost every possible property. Desktop = custom in this instance.
PS - in < CS4, you do this at the Project level. With CS4 up, you do it at the Sequence level.