Here is a simple example of layered pinning of each section on a scroll.
Layered Pinning From Top
See the Pen Jump to section with layering – ScrollTrigger by Puneet Sharma (@webdevpuneet) on CodePen.
Layered Pinning From Bottom
See the Pen Layered Pinning From Bottom – ScrollTrigger by Puneet Sharma (@webdevpuneet) on CodePen.