What is the best/easiest way to bisect a part?

I'm working on a VR exclusive game that is extremely similar to Beat Saber the main problem I have is creating the same effects as in the game. I want to bisect a part along the path that a saber takes but I have no idea how I would do this. I thought of possibly using UnionAsync but that would take decades of coding. If there is anything hidden away in the depths of Roblox's engine that could help me with this it would be greatly appreciated.