RMA Automation instead of manual entry

we need to the setup of RMA automation instead of manual entry if possible. I already asked receivable community, They said post a new question to OM community. That's why i posted this question. Because we shipped the materials to customers by lot wise method and so per day we generated more than 20 invoices(1000 or 2000 qty) as per customers requirement. Some times customer doesn't accept the invoices for some other reasons after 1 week of invoice generation. So we need to cancel or return those invoices. For RMA, We need to raise rma sales order and create