Actually that doesn't rule out what Superku is saying. @Superku I'm going to guess for a example that you would like to split a project into smaller pieces and fund raise for each piece.

Like
Run a kickstarter to raise money to make x-game's first 5 levels -> if successful -> run a new one to get the money for the next 5 levels. -> repeat till finished.
[I assume ->
This seems fine as long as they are done in consecutively not concurrently. But I would say to make the pieces as large as possible. Or just keep re-launching the campaign. <- ]

EDIT-> I'm going to email them for a clear answer. I very much would like to know this as well.
EDIT2-> An email has been sent to support and an answer is expected within the next week(or 2 business days as-per volume of current support emails in cue)

But you might have meant for example Sukerku World game and Superku RPG game. In which case these are 2 different projects but like Firoball says you can only raise for one at a time.