How to start an animation from the end of another animation?

So i have an animation that moves my characters hand left to right and another one that moves it up and down. I wanna stop the left to right animation wherever I want then play the up to down from that position.

I have tried blend tree but it makes it so at the end hand alwasy goes back to the middle.

Use the Animator. Simply create a transition between the L/R animation and the U/D animation.
Official Tutorial: here