Open RMA Conversion--DMT

For those that have upgraded or migrated from another system. How did you approach the open RMAs thru DMT. I can get the RMA Head,Detail and then I can replicate the receipts with that template. My question is when doing how did you handle the inventory side and then the disposition. I have some that have already been moved to job. I do not want to duplicate the cost of these RMAs or add items to inventory. Feel like there should be an open RMA load similar to AP and AR for the purpose of this. If anyone has some guidance on how they loaded these would be great.