If you are looking for a specific script to perform these tasks, two of the most popular community-standard tools are:
These scripts solve a fundamental After Effects limitation: the built-in "Scale Composition" script only resizes the active composition and its top-level layers, leaving nested "pre-comps" at their original, often incorrect, resolution. Infinite Resize Script
A "name your own price" tool available on aescripts.com. It is widely used for batch-resizing keyframes, vectors, and 3D layers recursively. If you are looking for a specific script
They handle locked layers, parented objects, 3D layers, and cameras, ensuring spatial relationships remain intact. leaving nested "pre-comps" at their original
The most critical feature is the ability to drill down through every nested pre-comp and scale them proportionally.