Lessers are actually lesser platinums... produced from the original platty daddy owned by Ralph Davis. You cannot produce them with what you have.
Breed two lessers together and you get an all white snake with blue eyes: http://www.newenglandreptile.com/ner...d=71&Itemid=63
Breed two yellow bellies together and you get an all white snake called an ivory (has an ivory-ish stripe down it's back with a gray head): http://www.newenglandreptile.com/ner...d=47&Itemid=63
If you breed a yellow belly to a cinny, you will get normals, yellow bellies, cinnies, and possibly a cinnamon yellow belly. Same goes for breeding a lesser to a cinny...
Just as an example...