Yes, I think you’re missing something!
Think of a timeline of nested VEGs as “what will be” your final output. Go ahead and tie each of your six sections together as your final, big timeline (I’ll call it “FINAL_VEG”). You can still make all the adjustments you mention, but you do those on the individual VEGs. Meaning, if you need to color correct a portion of the third section (I’ll call it “VEG C”), you do that color correction back on VEG C itself.
Then, when you resave VEG C and then go load FINAL_VEG again, you’ll see your change made. Make sense?
–KG