This is to know whether I can give all who helped me get the answer their due. As I see, there is provision only to award the bounty to one answer. Is there a way to award multiple answers?
The goal isn't to have multiple answers each containing a piece of the puzzle. It's to have a single, correct, comprehensive answer. Bounty provides a means of encouraging answers to tough problems by offering a reward: allowing you to subdivide this reward creates a situation where you're misleading those participating (who think they're competing for a big prize but only receive a portion of it) and potentially discouraging users from taking the time to write a complete answer.