sISK can be transferred to other wallets. Although the transfer feature is not available now, we are working on it to support sooner or later.
CP as much as the amount of sISKs transferred to another wallet will be deducted and you will no longer receive ISK Staking Rewards for the amount sent. Conversely, if you had received sISK from another wallet, you will also receive CP as well as the ISK Staking Rewards corresponding to the amount received.