Can someone help me figure this out there is no information on how to do this. Can someone help me?
Towers? On what path? We have even less info here
its a tower defense simulator game
Are you using a tile-based system? You could see if the cell the player is attempting to place a tower on is occupied by a path tile.
im using like small flat rectangles and waypoints
Could you give us your code, a image, or even a video to help us understand your code and how to achieve your goal?
I’d recommend looking at the #help-and-feedback:scripting-support topic template, since there isn’t much information here.
If your system is based on tiles, just record which tiles have path on them (in a table) then when the player wants to place a tower on a tile make sure the tile isn’t one of the ones in the table.
If your system is raycast based, just check if the RaycastResult.Instance is not a part of the path.
There are a lot of ways to do this and the question is very vague, if you add a picture, a few sentences of context, or some code we can probably help you better.
Where is the placement system? Do you have one? How does it function? Could you provide your code?
Edit:
Adding on to what @PersonifiedPizza said above, if your using raycasts you can check to see if the
Raycast.Instance.Parent.Name == “Path”
Or something like that. 
When the player clicks on their mouse, see if the player clicked on the path. If they did, don’t place a tower, if it’s not, place a tower.
I’m on mobile so I can’t type some code, but basically add click detectors on the ground and not on the paths.
Also to get the mouse location you need to type
game.Players.LocalPlayer:GetMouse().Position
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no one can help without the script
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local Remote = game.ReplicatedStorage[“ReplicatedStorage_CLOUD”].UnitControls.PlaceUnit
local Workspace = game:GetService(“Workspace”)
local Map = Workspace:WaitForChild(“Map”)
Remote.OnServerEvent:Connect(function(Player, Unit, Hit, Rotation, Can)
local Currency = “Money”
local Price = nil
local Level = “0”
Unit = game.ReplicatedStorage["ReplicatedStorage_CLOUD"].Units[Unit.Name].Levels[Level].Object[Unit.Name]
Price = game.ReplicatedStorage["ReplicatedStorage_CLOUD"].Units[Unit.Name].Levels[Level].Cost.Value
if Can == true then
local Towers = 0
for _, v in pairs(Workspace:GetChildren()) do
if v:FindFirstChild("Configuration") then
if v.Configuration:FindFirstChild("Owner") then
if v.Configuration.Owner.Value == Player.Name then
Towers = Towers + 1
end
end
end
end
if Towers >= Map:WaitForChild("Configuration"):WaitForChild("TowersLimit").Value then
game.ReplicatedStorage["ReplicatedStorage_CLOUD"].GameNotification:FireAllClients(Player, "Unit Editor", "You've reached towers limit")
else
if game.Players[Player.Name].leaderstats[Currency].Value >= Price then
game.Players[Player.Name].leaderstats[Currency].Value = game.Players[Player.Name].leaderstats[Currency].Value - Price
Unit = Unit:Clone()
local ConfigFolder = game.ReplicatedStorage["ReplicatedStorage_CLOUD"].Units[Unit.Name].Levels[Level].Settings:Clone()
ConfigFolder.Name = "Configuration"
ConfigFolder.Parent = Unit
Unit.Parent = game.Workspace
if Unit:IsA("Model") then
if Unit:FindFirstChild("Humanoid") then
else
for i, v in pairs(Unit:GetChildren()) do
if v:IsA("Part") or v:IsA("MeshPart") then
v.Anchored = true
end
end
end
else
Unit.Anchored = true
end
if Unit:IsA("Model") then
if Unit:FindFirstChild("Humanoid") then
else
for i, v in pairs(Unit:GetChildren()) do
if v:IsA("Part") or v:IsA("MeshPart") then
v.Transparency = 0
end
end
end
else
Unit.Transparency = 0
end
if Unit:IsA("Model") then
for i, v in pairs(Unit:GetChildren()) do
if v:IsA("Part") or v:IsA("MeshPart") then
v.CanCollide = true
end
end
else
Unit.CanCollide = true
end
if Unit:IsA("Model") then
-- Cannot rotate group
else
Unit.Orientation = Rotation
end
if Unit:IsA("Model") then
Unit:SetPrimaryPartCFrame(CFrame.new(Hit.Position))
Unit:SetPrimaryPartCFrame(CFrame.new(Unit.PrimaryPart.Position.X + Unit.PrimaryPart.Size.X / 2, Unit.PrimaryPart.Position.Y + Unit.PrimaryPart.Size.Y / 2, Unit.PrimaryPart.Position.Z + Unit.PrimaryPart.Size.Z / 2))
else
Unit.Position = Hit.Position
Unit.Position = Vector3.new(Unit.Position.X + Unit.Size.X / 2, Unit.Position.Y + Unit.Size.Y / 2, Unit.Position.Z + Unit.Size.Z / 2)
end
if Unit:FindFirstChild("ClickDetector") then
Unit.ClickDetector.MaxActivationDistance = 10
end
if Unit:IsA("Model") then
Unit[Unit.PrimaryPart.Name].PlaceSound:Play()
else
Unit.PlaceSound:Play()
end
if Unit:FindFirstChild("Configuration") then
if Unit.Configuration:FindFirstChild("Owner") then
Unit.Configuration.Owner.Value = Player.Name
end
end
else
game.ReplicatedStorage["ReplicatedStorage_CLOUD"].GameNotification:FireAllClients(Player, "Unit Editor", "Not enough ".. Currency.. " to place this item")
end
end
else
game.ReplicatedStorage["ReplicatedStorage_CLOUD"].GameNotification:FireAllClients(Player, "Unit Editor", "You tried place this item too far away from you")
end
end)
Use the player’s mouse to identify the part it is currently being targeting on using render service. (connection)
(PS: Use TargetFilter and filter the tower so it wont go towards your cam)
Then add some code that basically identifies if whether the part is a path part or not.
If it is not, when you do a Mouse.Button1Down event it will go through and make sure to disconnect the connection to avoid FPS drops.
If it is a path part, it will not be placed (assuming theres a value that sets it to false)
You just need to raycast down from the position and check if the raycast hits the path or not.
https://developer.roblox.com/en-us/articles/Raycasting
Edit:
Also when the camera’s CFrame changes too 
I don’t think there should be an FPS drop unless it’s creating multiple connections (which it shouldn’t). There should only be one connection to Button1Down, so you shouldn’t need to disconnect it (unless you don’t use a debounce). Disconnecting instead of using a denounce and using a denounce have basically the same performance in this case though.
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https://developer.roblox.com/en-us/api-reference/event/Mouse/Move
Instead of an event which is fired every frame I’d recommend to listen for the “.Move” event to fire on the mouse object as this will occur a lot less frequently and for this task it is all that is necessary.