In Odoo 18, to process an internal payment transfer between two branches (Branch A to Branch B), you can use an internal transfer journal entry, which ensures proper tracking of funds.

First, you need to create an Internal Transfer Account. Navigate to Accounting → Configuration → Chart of Accounts and create a new account named "Inter-branch Transfer." Set the account type as Current Assets (or Liability), assign a unique code like IBT_001, and enable Allow Reconciliation. This account will temporarily hold the transfer amount until it is recorded at the receiving branch.

Next, record the payment from Branch A by going to Accounting → Customers → Payments and creating a new payment entry. Choose Send Money as the payment type, select Branch B as the customer/vendor (you may need to create it as a company contact), and select the appropriate bank/cash journal for Branch A. Enter the amount to be transferred, and set the destination account as "Inter-branch Transfer." In the memo field, you can add a note like "Transfer from Branch A to Branch B." Once validated, this transaction will deduct money from Branch A’s bank and temporarily store it in the inter-branch transfer account.

After that, you need to record the receipt in Branch B. Go to Accounting → Vendors → Payments and create a Receive Money transaction. Select Branch A as the source, choose the appropriate bank/cash journal for Branch B, and enter the amount received. Again, set the destination account as "Inter-branch Transfer" to ensure proper accounting alignment. Once validated, this step will move the money into Branch B’s bank account, completing the transfer process.

This method ensures that internal transfers are properly recorded and reconciled, maintaining financial accuracy between the two branches. If needed, you can later reconcile the transactions to match the entries in both accounts. Let me know if you need further clarification!