Simple question about a graph controlling

ı have a specific graph from designed in blender, ı need to add some point it by using “addkey” in unity to user controll this point by keyboard (just the some specific part of the graph can change and create curve at that points) how can ı add a script for only these specific points? is it possible for this to use invisible objeckt. By the way ı cant split the graph cause ı have to add spline follower . ı am the new in this platform so ıdk if there is a another trick for this. I'll be glad if you can help me