As MC5C says... This is the method recommended by the excellent Frets.Com site. The truss rod is used, if necessary to set neck relief to the proper amount.
The action is then adjusted via the nut-slots and the saddle height.
Classical guitars of all sorts usually need higher relief at the 12th fret because nylon strings have a higher "amplitude of vibration" (they move in bigger arcs) than steel strings.
Because the diameter of nylon strings is more uniform than are steel strings, the saddle is usually pretty much level and also not angled as they are on steel string instruments.
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