Hey Jeff,
thanks for responding. Sorry if it was confusing. What I am doing is doing trying to animate in Final cut using drawings I have made and then making things move like clouds and waterfall. I have this scene where I made clouds out of the solid element in the effects window and just shaped it, pretty easy. Now with the water fall, I just made a long slim rectangle and put lighter streaks to make it look like water movement. so I want the waterfall to fall down but not have this blue huge rectangle cover the scene. So I am trying to cover it so I made another rectangle and thinking I could somehow put that in front of the water fall rectangle and then blend the rectangle with the scene, or like mask it so you cant see the waterfall one, only what what I want to be seen. then I would key frame the water fall to fall. maybe that helps, its killing me and got to know. I may have to send an image upload. I did it before but not sure if it was the same way.
thanks
Gary