Help with sprite animations

Hi,

Im sorry if this is an easy answer - I am animating a floating head enemy, so I have his body as one sprite and the eyes and tentacles overlapped as another layer. Each layer will animate differently depending on what happens to the enemy but all will play together to look like one sprite. Easy, but then I want him to bob up and down slightly as its all happening.

I would have to use different clips for different states but I'm not sure how i could fluently connect them all if he is bobbing at different heights when each clip is called for. Is there a way to animate the entire transform to bob whilst all the other clips are playing at the same time?

Thanks