How do you edit the entire composition?

[NebulaEdit]

The best example of my question is this:
I insert multiple images/videos, but I want a transition in between. Say one section of the composition has two images or two videos in the frame, and I want to apply the transition to the entire thing. Is there an easy way to do that? Or do I have to apply the same transition to each individual video/image?

Another example is a rotation transition, I have two images on screen and I want them to both rotate the same way, but if I apply the transition to both they rotate their own way because the rotation is relevant to the individual images. Is there a way to apply one rotate command to have the entire frame rotate?

Thanks in advance.

[Towerguy · Accepted solution]

Hi. There are several ways to go about what you want to do. In your first example you can precompose the layers then do the transition in the main comp. You could also parent the layers to a Null for your rotation example without precomposing.

[NebulaEdit]

Oh... duh. Forgot about the nulls. Thanks!