Associating two separate lists with different structures.

Hi. I am looking for some help with some Data Trees and how they associate with each other. The end goal is to test a multiple lists of points to see if they are contained within closed curves. 

The tricky part is I want specific points to check against a specific curve. All the curves in the right panel are on different levels {0} {1} {2}, and so on. The points on the left are organized by level and curve (because there are multiple curves on a certain level), so {13;31} as shown is level 13, curve 31. I want to check if the curve on that level contains the points on that level. 

So for example, I want it to check if the the closed curve on let's say level {A}, contains points from the curve {A,1} {A,2} {A,3}: level {B} to check {B,1} {B,2}

I have tried relative items but that was not working, possibly because they are not in the same tree structure. 

Hopefully someone is able to help!