Hi, do we need to set up the Refund journal in Odoo (v16) for customer / vendor invoices or can we use customer invoice journal? What would be the right solution?

If creating new journal for returns what type should I choose? For buyer refund sales and for vendor refund purchase?

Also, how to choose what ends up in which journal? I know that by default sales are going to end up in Customer Invoices and Purchases in Vendor Bills but how can we move something to another journal?