Generating multiple object on changing transform

[spedepasanen]

Hello,
I came across issue with prefabs and curvy just now, and I dont quite get what this means:

So the solution is to not include the generated objects in your prefab, which is the right thing to do anyway, to avoid having huge prefabs.

I tried removing the created mesh from the prefab(I just deleted the created mesh and then saved the prefab), but that results a multiple meshes when I run the game on Editor. What would be the correct way to do this so I dont end up with multiple duplicate generated meshes?