Create a new account, don't care about the settings.
Close TB
Copy the account.cfn file from the source account to the new account
Start TB
Alter the address that belongs to your new address to the one you really want.
But if it's only the address that's different (server, username and password the same) then you could use folder identities or the %From macro in templates to use that address.
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I'm just a user of The Bat! I don't work for Ritlabs.