How do I make smooth movement to a position after an event

I want to make a sprite move its self into a specific position once some requirements are met. The only problem is that I want the movement to be smooth (aka not use "Set position" which just causes it to jump there). I tried using Custom Movement but haven't made any progress yet .

Give the object the 8-Direction Behavior and then control it that way.

I don't want the player to move it but have it move on its own (player presses a button while inside and area and the sprite moves its self into the correct position) and the 8-Direction Beh. does not include an expression that would enable me to move it into position (Since the movement isn't specific I don't think I can use it)

Oh man. Keep playing with it, you'll understand it soon enough.