PreProduct allows you to reactivate finished listings. 

Go into the PreProduct Dashboard and find the finished listing you would like to reactivate, it will be below current listings, in the past listings section. Click into the finished listing, and on the left-hand side there is a ‘Reactivate listing’ button. If the shipping statement is a date in the past PreProduct will require you to update this date first and then you will be able to reactivate the listing.