We actually dont have a way to do that since once it's in the system we would treat it as a snipe and start emailing you when you are being outbid and that means our computers would have to check the auction every few hours etc etc and that would take away from the resources doing real snipes etc.
Also one reason so many people snipe is they forget to check back on items they're watching. I used to do it allllll the time.
What you can do is put it in your watchlist on eBay. And watch it from your My eBay page.
When you are ready to convert it go to:
http://www.auctionsniper.com/importwizard.aspxThat will find all the items you are watching and will prompt you to import them as snipes.
Thank you