Mecanim state that keeps last pose?

Hi, I am working on some animations using mecanim and was wondering if it is possible and how to create a state with no animation that keeps the pose of the last animation frame of the previous state.

What i have:

• an animation from pose A to pose B

• an animation from pose A to pose C

• a mecanim state for each of these animations (AtoB and AtoC)

What i want:

• a next state with no associated animation into which the two already existing states transition that keeps pose B or C, depending on the previous state

I would like to use that sate as an "idle" state that does not revert to a certain default pose but simply maintains everything as it is.

Is this possible or will i have to create a state that keeps pose B when transitioning from AtoB as well as a state that keeps pose C when transitioning from AtoC? With several "idle poses" this could eventually lead to a lot of redundant states...

Thanks in advance!