Transferring partial BTC between wallets if I know both private keys [duplicate]

Transferring partial BTC between wallets if I know both private keys [duplicate]

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Is there a way to transfer/import partial amounts of BTC from one wallet to another off the chain in order to avoid transaction fees? I assume this is how services like Coinbase get around letting you transfer funds from your Coinbase to GDAX wallet without any transaction fee since they know both private keys. Is this possible? If so, how would this be done with something like bitcoinjs-lib?

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