As far as I know, the movie-tied-in comics (from various franchise, not only Terminator) published by IDW are usually structured into:
- Official Movie Prequel (sometimes "Movie Prequel")
- Title one
- Title two
- Official Movie Adaptation
For Transformers: Revenge of the Fallen, it is:
- Official Movie Prequel
- Alliance (Transformers: Alliance)
- Defiance (Transformers: Defiance)
- Transformers: Revenge of the Fallen Movie Adaptation
- Issue 1
- Issue 2
- Issue 3
- Issue 4
For Terminator Salvation, it is:
- Official Movie Prequel
- Sand in the Gears
- Terminator Salvation Movie Adaptation
- Issue 0 (Terminator Salvation: Movie Preview)