I will try to explain again:
Example:
We have a EPOS system, which runs on iPad. Our store sells iPads to custmers so they can use our EPOS. The iPads are avaiable in two conditions (variants), New and Used. Customer buys iPad but doesnt like our system, therefor wants to return the iPad. I create a return on the order that initially was a New iPad. The iPad arrives to our warehouse, so i restock it, but it is restocked as New. I want it to be restocked as the Used variant.