When you have an account in another website like Perfect Money or Advcash or any cryptocurrency exchanges/wallets, and you wish to deposit/withdraw to/from your account regularly; you can add the information to My Accounts section of your GC.
Once added, you do not need to copy and paste the wallet in your GC deposit or withdraw request every time you would like to make a transaction. You can choose while making the request as it is pre-saved.