Can you have a layer stay frozen still at its first frame until you want it to start, then have it play, and stop at its last frame, and hold until the end of the composition? I'm on CS4. Also, I'd prefer not to split the layer into three layers (or I end up with over 60 layers in the composition)
Is this a layer with keyframed animation? If so, then extend the layer to the comp's duration, then select all the keyframes, and drag them to where (in time) you want the animation to begin. If it's a movie, then you should look into setting keyframes for "time remapping".
Although that's a great idea, the layer is video footage
Ok, apparently I didn't read the last sentence of your post. Time remapping makes sense. I've used it for other things before, I don't know why I didn't think of that. Thanks!