Volume 3 of the NHB training series teaches you the secret of submission chains a series of techniques that combines punishing, joint-wrenching submission holds into natural progressions. When performed as drills, they teach you how to set up and apply dozens of different finishing holds and smoothly transition from one technique to another. When applied in a fight, they enable you to automatically apply the best submission technique for the situation, as well as how to counter your opponent's counters so you stay in control.
Grappling in any "live" situation is really last resort stuff. The priority - if avoidance and escape is not an option - is pre-emptive action via ballistic impact. If you have ended up on the ground, then a mistake has been made and you will have to make the best out of a bad situation - and quickly. The priority is to hurt your combative subject and get back to your feet as soons as you can.