How to forward a TX to another address

How to forward a TX to another address

Having a bitcoin tx, where I have one of the output (utxo#1) private key to unlock.
I want to be able to create a tx (#2) that spends this utxo#1 to a different address. How can I do it using code and bitcoind rpc calls ?
Could it be something to do with "lockunspent" ?

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