Dear Tony Robson,
Thank you for your question.
1) To change "FOR SALE" to "SOLD" possible with help VehicleManager :: Language Manager - put "FOR SALE" in Value constant choose Language and rename as you want.
2. Make feature like: label will changing after vehicle has been sold and "SOLD" vehicles become "UNPUBLISHED" will be customization service. It is paid work. Such option need develop special for You.
"Sales Manager" it is not module. This part of component options.
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Thanks,
Taras
OrdaSoft team.