Maybe I wasn't clear enough.
I know I can create new wallets, what I'd like is to create more accounts in the same wallet.
When one account already exists, the create account button eventually leads to a dialog that asks which account to pay the registration from.
Turns out, only lifetime members can do that.
Since AFAIK it is not possible to correlate accounts to a wallet by the derivation of the keys, this must be a limitation implemented on the wallet side, or (for instance) openledger would have no way of knowing that account N is part of the wallet where the original account was also registered.
In fact, for privacy reasons it would be important to confirm that the above is true.
But to reiterate, the question is how to have more than one account per wallet while also registering the 2nd, 3rd, etc account, with (for instance) openledger.