How Do I Make A Scrollable Container Within Container?

I’m wondering, how do I make a scrollable container within a container?


So for example I created a section within a 3x2 parent container and then put the layouter tool to display these collapsible sections, but I’m thinking this is not gonna be the feasible solution to display these collapsible sections. So I’m wondering how do i make a container that scrolls vertically within this container or create something that has similar functionalities.