Please be more specific. What exactly are we talking about? Make the layer follow the motion of another object? Make the letters individually follow a 3D path? Make them follow a 2D path? For case 1, copy&paste, parenting or pickwhip expressions on the position property will obviously do, for case 2 each letter will have to be its own layer, for case 3 you can copy&paste the position keyframes as a mask and then assign that mask as a text path in the Advanced options of the text layer.