:SubtractAsync() does not do anything

Help and Feedback Scripting Support
#1

I have these 2 scripts that are trying to divide a part on where the player clicks however currently SubtractAsync does absolutely nothing

client:

local mouse = game.Players.LocalPlayer:GetMouse()
local mouseStatus = "Up"

mouse.Button1Down:Connect(function()
	mouseStatus = "Down"
end)

mouse.Button1Up:Connect(function()
	mouseStatus = "Up"
end)

game["Run Service"].RenderStepped:Connect(function()
	if mouseStatus == "Down" then
		local hit = mouse.Hit

		if mouse.Hit and mouse.Target:IsDescendantOf(game.Workspace.Folder) then
			game.ReplicatedStorage.RemoteEvent:FireServer(mouse.Hit, mouse.Target, mouse.TargetSurface)
		end
	end
end)

server:

local normals = {
	["Enum.NormalId.Right"] = Vector3.new(0,90,0),
	["Enum.NormalId.Back"] = Vector3.new(0,180,0),
	["Enum.NormalId.Left"] = Vector3.new(0,-90,0),
	["Enum.NormalId.Top"] = Vector3.new(90,0,0)
}

game.ReplicatedStorage:WaitForChild("RemoteEvent").OnServerEvent:Connect(function(player, hit, target, normal)
	local newPart = Instance.new("Part")
	newPart.Position = hit.Position
	newPart.Anchored = true
	newPart.Size = Vector3.new(0.1,0.1,5)
	newPart.Parent = game.Workspace
	
	if normals[tostring(normal)] then
		newPart.Orientation += normals[tostring(normal)]
	end
	
	local newUnion = target:SubtractAsync({newPart})
	newUnion.Anchored = false
	
	newPart:Destroy()
end)
#2

You have to parent the union part to workspace.

#3

Which part are you referring to, the parts that you should be able to slice are In a folder in workspace

#4

You have to parent newUnion to workspace, and optionally, you can delete the target part after the subtract operation.

local normals = {
	["Enum.NormalId.Right"] = Vector3.new(0,90,0),
	["Enum.NormalId.Back"] = Vector3.new(0,180,0),
	["Enum.NormalId.Left"] = Vector3.new(0,-90,0),
	["Enum.NormalId.Top"] = Vector3.new(90,0,0)
}

game.ReplicatedStorage:WaitForChild("RemoteEvent").OnServerEvent:Connect(function(player, hit, target, normal)
	local newPart = Instance.new("Part")
	newPart.Position = hit.Position
	newPart.Anchored = true
	newPart.Size = Vector3.new(0.1,0.1,5)
	newPart.Parent = game.Workspace
	
	if normals[tostring(normal)] then
		newPart.Orientation += normals[tostring(normal)]
	end
	
	local newUnion = target:SubtractAsync({newPart})
	newUnion.Anchored = false
	newUnion.Parent = workspace -- Or any instance under workspace
	target:Destroy() -- Optional

	newPart:Destroy()
end)

Or another solution is to just parent newUnion to the same parent as target

local newUnion = target:SubtractAsync({newPart})
newUnion.Anchored = false
newUnion.Parent = target.Parent
target:Destroy() -- Optional
#5

Ok so it does work however what i wanted it to do was simply slice off the part where you see my mouse is going which it does actually do the new parts have a hole in them where my mouse was but also as you can see a bunch of unions get added which i dont want

sorry for how short the video is im recording in 1440p and if it is long roblox doesnt let me post