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Certainly. He/she should contribute thier expertise afterwords and seek approval for any changes he/she recommends.
It depends if the previous sales manager had good sales results, I would say he can continue, but it would be much better if he brings some fresh new ideas and upgrades to the strategy. If the previous results were bad and if t there was many flaws in the previous strategy, certainly from my point of view it would be a very bad move if he continuew working based on the previous manager's strategy.