Imported bitcoin address
imported bitcoin address which I can not transfer to anybody, if I want to transfer it is asking private keys, but I don't have private keys


It sounds like you have imported the address as a watch-only address, meaning your wallet watches for transactions involving it, but as you say, cannot spend any coins because it doesn't have the private key. This would have happened if you had used importaddress instead of importprivkey. Without the private key you do not own those bitcoins, you are simply looking at someone else's transactions.