Exiting the sell put options

#1
Hi All,

Sorry if it's a lame question.I am newbie.

When we sell a put option a portion of money is blocked as margin.
My question is if I want to exit this position (exit short sell position) before Expiry, do we need extra balance in our trading account on top of what is already blocked as margin or we our position from sell options anytime as margin is already blocked?
 

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