Re-subscription of tokens

@sujith I have a situation where I am trying to resubscribe the instrument tokens through java API.
For ex: I have 10 tokens subscribed during the connect and want to make some changes at later point of time(i.e add new tokens or remove some existing tokens).
Do I need to disconnect the web socket and pass the new set of tokens and connect again?
Please let me know how to do this in an efficient way?
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