Can I keep track of lots that didn’t sell in one auction and reassign them to a future auction without repeated data entry?

Yes, the Main Inventory file can store any lots that remained unsold after your auction. In fact, it doesn’t matter if the lots came into the auction from the Inventory System at all. You can globally reassign all items from one auction name to a new auction name using the Auction Utilities Menu, Auction Field Name Assignment. If you’d rather choose the lots to be reassigned individually, it’s easy to do in Inventory File Maintenance. There is a quick Auction Name editing feature in the Browse screen too.