Can an object change direction on a motion path?

Hello Heroes! 

I have a quick question about motion paths (this is my first time using them...awesome feature!) 

Is there a way to make an object change direction on the path? for example: I would like to have a user-invoked "tray" that slides up from the bottom of the screen, and slide down when it's closed. 

Is this possible? I've toyed with it for about 2 hours now (to be honest, at lot of that time was getting acquainted with the tool). In the interest of time, I thought I'd ask you smart folks!


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