Make a movable union like hole which colliding with part will make it see-through only by the parts colliding with the part

Help and Feedback Scripting Support
1

I want to make an interactable grass system which once you walk onto the grass, the parts you walked on disappears, or make a hole in the grass, and once you make 2-3 holes, it fills up again. I currently have this script;

local ins = Instance.new("Part")
ins.Parent = workspace
ins.Anchored = true
ins.CanCollide = false
ins.Size = Vector3.new(4, 1, 4)
ins.Material = "Grass"
ins.Name = "InteractiveGrass"

script.Parent.Parent.Touched:Connect(function(a)
	if a.Parent:FindFirstChildWhichIsA("Humanoid") then
		local rslt = math.round(a.Position.X/4)
		local chsn = rslt*4
		ins.Position = Vector3.new(chsn, math.round(a.Position.Y), math.round(a.Position.Z))
		
		if a.Position.Y >= 2 then
			ins.Position = Vector3.new(chsn, math.round(a.Position.Y + 1), math.round(a.Position.Z))
		end
		
	end
end)

Which does this;
robloxapp-20220628-1443360.wmv (1.5 MB)

The bottom plate labled “Ground” is 1 hole part. The top plate named “Grass” is set to cancollide = false. I want to have the instance.new do this instead of what the video showed;

image
image1920×1080 280 KB

Any ideas on what to do?