Permanent Crew Mod

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How can we reset Permanent Crew after it is initially set?    For instance, I assigned Capt A to Ship 1 a Tier  9 but now have Ship 2 a Tier 10 and since Capt A is a 19 pointer wish to transfer him to Ship 2 and reassign him as Permanent Crew on Ship 2.    Can this be done and how do I do it?   If it can't be done it certainly needs to be considered.    Any help would be greatly appreciated.