Bank sub accounts in manager

Is it possible to create Bank sub accounts in manager?

Not possible. You can create groups and put accounts under them or create custom control accounts made up of bank accounts.

@Abeiku, please run me through how your suggestion can be achieved. Thanks

See the Guides in particular

Structuring Accounts

Chart of Accounts: Build a chart of accounts | Add an account | Add custom control accounts

Please read the links provided by @Patch.