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I noticed in the rulebook that it says that a warcaster's control area is equal to a number of inches twice their current focus. Does that mean that once they have allocated a focus point to a warjack that their control area has shrunk as they have less focus that turn? Or, does 'current focus' refer to their base focus value as a model(for example, Sorscha has focus 6- meaning her control area is always 12?).

Sorry for the noob question but this is unclear to me.

It's the current focus stat, not the number of focus tokens on the model. A warcaster with a focus of 6 always has a 12" control radius unless a game effect reduces it or increases it (Cygnar Squire or Warwitch Deneghra's feat)