Process to 'sell' inventory to supplier without recording revenue

We are closing down a facility and moving our mfg to an outside supplier.  We have inventory to sell to them,  a one time sale of excess inventory and on-going 'sales' as a supplier to them in the future.  We are currently using spreadsheets for this process.  It is becoming a mess. 

We are planning on using a new order type/ line type in OM and a new Invoice Type in AR.  Our Autoaccounting rule for the account segment is 'Transaction type' so we can set the 'Revenue' account in the transactions type to a non-revenue account.  We are pretty confident it will work and are planning on tesitng it out etc,