Thanks,
But my query is to save same coin in different wallets at the same time so I can access it through app wallet or through Cold wallet, is this possible?
You're refering to storing the same private key in different wallets?
If this IS your question, the answer is "YES", most wallets allow you to export your private keys in some way or another, and a lot of wallets allow you to import private keys...
for example, if you create a wallet using bitcoin core, generate a new private key/public key/address, then send funds to this address => you can export the private key that was used to generate this address and import it into (for example) electrum.
From this moment, you can spend those unspent outputs using bitcoin core and electrum, but as soon as you use either wallet to generate a transaction using the unspent outputs, the other wallet should no longer be able to use the same unspent output. If you created a transaction from both wallets, using the same unspent outputs, only one of the generated transaction could ever end up in a block, the other one would be invalid...
A final note would be that not ALL wallets have the functionality to export private keys, and not ALL wallets allow you to import private keys, but there are several out there that do have this functionality