Hi,
the point was to have this option generally, not only for one product. We would like t sell e-tickets, using HikaShop + HikaSerial. It is common that for the ticket are at least two prices, Early bid, and common price. So wee ned option to enter the Early bid price, with date validity, plus sometime some kind of "Super early bid", or "Last chance" price.
I guess it could be achieved using some Custom fields and Mass action, but it will be bit user unfriendly, as prices and Early bid prices will be on two different places.
Second option would propably be to use some variants, one for Early bid, with Available to date, but again, this is not really user friendly.
Pavel