Getting the previous part to the previous one?

Hello i am making a undo button for my game, where u can undo parts that you create, this all happens on the client, i already got a previous part but i want to get the previous part to the previous one

Code:

PartButton.MouseButton1Click:Connect(function()
    local Part = game.ReplicatedStorage.NewPart:Clone()

    Part.Parent = workspace.Parts

    -- Set the previous part

    PreviousPart = Part
end)

Undo.MouseButton1Click:Connect(function()
    if PreviousPart ~= nil then
        PreviousPart:Destroy()
        PreviousPart = nil
    end
end)