Multiple Trajectories....

Hello all, I am new to CREO. I need to create a curved beam whose height reduces with length. It has a height of 800mm at the start, then the curve starts and at the end point it has a height of 500mm. The radius of the curve is 500mm. I have been trying it, but couldnt make it out. Please suggest me a way to get it done.

Thanks and regards, Madhavan.