In Odoo 16, you can still perform internal transfers between journals, even though the "Internal Transfer" option doesn't directly appear from the bank account's drop-down menu. Here's how you can do it:

1. Navigate to the Accounting dashboard: Access the Accounting module and go to the "Dashboard" section.
2. Create a new payment: Click on the "Create" button in the top right corner and select "Payment."
3. Select the source journal: In the payment form, choose the journal from which you want to transfer funds as the "Journal."
4. Choose the transfer type: In the "Payment Method" field, select "Internal Transfer" to indicate that you're moving money within the company.
5. Enter the destination journal: In the "Account" field, select the journal to which you want to transfer the funds.
6. Specify the transfer amount: Enter the amount you want to transfer in the "Amount" field.
7. Add a reference (optional): If needed, provide a brief description or reference for the transfer in the "Memo" field.
8. Save and validate the payment: Click the "Save" button to create the internal transfer payment. Once saved, click the "Confirm" button to validate and finalize the transfer.

This process will effectively transfer funds from the source journal to the destination journal without the need for the explicit "Internal Transfer" option.