Hey again @Bobsondo!
There isn’t really a way to do this effectively with points. You would need to use the spline path itself.
Honestly I don’t suggest using a behavior tree for this. You’d get better results from such simple activity from just using the AI controller/ Actor Blueprint. You COULD take a lot of the functionality and put it into a BTTask.
Here are some other threads with accurate methods of moving AI’s along a spline!
You should be able to get what you need from those. Hope that helps!
If you really want to get into it, there is also this sample project/write up on how to do these things: