[rú bì shǐ zhǐ]   

如    臂    使    指    像胳膊支配手指那样。比喻指挥如意，没有牵制。 褒义>

比喻指挥如意，没有牵制。

As the arm directing the fingers -- command with ease as one wishes

如鸟兽散    如胶似漆    如石投水    如痴如梦    如出一辙