Bid groups should be helpful:
http://www.auctionsniper.com/faqbid.aspx
There's even a tutorial.
This might also help:
http://www.auctionsniper.com/rollover/mysnipesaid.aspx
And this:
http://www.auctionsniper.com/tutorial.aspx
And this:
http://www.auctionsniper.com/helpsnipeit.aspx
Of course, there's this:
http://www.auctionsniper.com/help.aspx