You need to use RemoteEvents to create part, example:

-- Client
local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()
local Event = game.ReplicatedStorage.RemoteEvent -- RemoteEvent location

Mouse.Button1Down:Connect(function()
    Event:FireServer("CreatePart") -- Fire server with argument "CreatePart"
end)

-- Server
local Event = game.ReplicatedStorage.RemoteEvent -- RemoteEvent location

Event.OnServerEvent:Connect(function(player,arg) -- The first parameter is player, second parameter is argument send by client
	if arg == "CreatePart" then -- Check if argument is equal to CreatePart
		-- Clone part to Workspace
		local Part = game.ReplicatedStorage.Part:Clone()
		Part.Name = "ClonedPart"
		Part.Parent = workspace
	end
end)

Also for your script do not put the "Movement" in workspace, put in ReplicatedStorage.

Now create a RemoteEvent in ReplicatedStorage, and create a Script in ServerScriptService And put this code:

-- ServerScript(Script)
local Event = game.ReplicatedStorage.RemoteEvent

Event.OnServerEvent:Connect(function(player,arg,position)
	if arg == "CreatePart" then
		local ClonedPart = game.ReplicatedStorage.Movement:Clone() -- Location of Movement with :Clone()
	    ClonedPart.Parent = workspace.Clones
	    ClonedPart.PrimaryPart.Position = position
	end
end)

Now on your LocalScript put this code:

local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()

local Event = game.ReplicatedStorage.RemoteEvent -- Event location
-- Put the Movement in ReplicatedStorage
local ClonedPart = game.ReplicatedStorage.Movement:Clone() -- Clone the Movement
ClonedPart.Parent = workspace -- Set parent to workspace
local Part = ClonedPart.PrimaryPart -- PrimaryPart of model
local position -- Do not change

Mouse.Move:Connect(function()
	local posX = Mouse.Hit.X
	local posY = 0
	local posZ = Mouse.Hit.Z
	
	position = Vector3.new(posX,posY,posZ) -- Set position to variable "position"
	Part.Parent:MoveTo(position)
end)


Mouse.Button1Down:Connect(function()
    Event:FireServer("CreatePart",position) -- Fire server with argument "CreatePart" and PartPosition
end)

Hope it helped :)

Wiki pages

RemoteEvents/Functions