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Hello @gargi7 what you suggest is a very popular idea. It is highly unlikely that King will ever allow you to transfer unused moves from one level to another though. If they did people would be collecting the maximum 255 extra moves and potentially carrying a hundred or more to the next level. This would make following levels too easy and lose king money.
Additionally if they did introduce what you suggest then they would have to modify all of the levels to take account of the potential extra moves and ultimately this would make the levels too difficult for players that can't purchase extra moves.
Please consider adding your vote to the idea I have linked below