The method for transferring funds to a sub-account is as follows:
When transferring funds from a wallet to a sub-account (copy trading account),
1) First, transfer the funds to the ‘Main Account’ that holds the ‘Sub-Account’.
2) Afterwards, when you start copy trading with the ‘Sub-Account’ or add funds to the ‘Sub-Account’ for copy trading, the transfer of funds from the ‘Main Account’ to the ‘Sub-Account’ will automatically complete.