Go to the RMA configuration menu.
This is the configuration for the RMA, just configure the settings as per your requirements.

Dynamic RMA Stages list view.

Stage form view. Here you can enable some settings like enable cancel button for that particular stage, which is the next stage, etc...

Reason for the return orders.

Create RMA for sale order by clicking on create RMA button.
(make sure the sale order, delivery and invoice are confirmed.)

By clicking on the create RMA button, it will open a wizard to select a full replacement or full return of the product update the product qty accordingly and click on confirm.

Also, customers can create RMA from the portal.

By clicking on the 'Return/Refund Replacement' button, this wizard will pop out, here customer has to enter the request type and quantity.

Customers can see the RMA request from the portal.

If a customer approves a return RMA, then it will create a return order for that product automatically.

Return order list view.

Now the order is in 'Processing' stage.
Note: The stage movement of the order is based on button clicks. It does not automatically change stages after order validation.

Return invoices are also visible on the portal.

Create a replacement RMA from the portal.

When the RMA for replacing the product is confirmed, two operations will created. one for new product delivery and another for picking old products.

Once the delivery order is validated, the RMA stage will change to 'Processing'.

The RMA Stage is done after both delivery and picking are done.