How To Apply Tweening To An Entire Model?

So I am working on an elevator using Tweening. It works fine with this script however I want to use as few scripts as possible to move the entire elevator. I could just put this in every part in the elevator but how can I apply one script to all the parts in the elevator model?

platform = script.Parent

local TweenService = game:GetService("TweenService")

local TweenInfo = TweenInfo.new(5,Enum.EasingStyle.Linear,Enum.EasingDirection.Out,0,false,0)

local platformMove = {CFrame = platform.CFrame + platform.CFrame.upVector * 11}

local openFunction = TweenService:Create(platform,TweenInfo,platformMove)


openFunction:Play()