How to fix this Cframe script? Move it to position rather than studs?

Hello,

So some before created this script and I wanted to know if there was a quick fix to my issue. Right now, the script is set to move a certain about of studs. Is there anyway to making this script so that it move to another bricks position? I.E If part A is located at (0,3,0) have Part B move to there? Thanks, Anthony

local detector = game.Workspace.Part.ClickDetector; -- Variable for the ClickDetector
local tween_service = game:GetService("TweenService") -- Variable for the TweenService
local curtain = workspace:WaitForChild("Curtain"); -- Variable for the Curtain
local old_pos = curtain.CFrame; -- Variable for the Curtain's CFrame that we will be position the Curtain by.
local first = false; -- Variable to keep track of whether the part's supposed to go up or down.
local info = TweenInfo.new(1, Enum.EasingStyle.Linear, Enum.EasingDirection.InOut); -- The TweenInfo. The part will take 2 seconds to reach either up or down in a perfect situation. It's going to move linearly.
local y = 50; -- Variable for the amount of studs the part will go up.
local cframe; -- Variable for the CFrame that the part will need to reach.

function move_part() -- Declaration of the function that will later be connected with the detector's MouseClick() event.
    if first == false then -- Checks if it's the first click of the user.
        first = true; -- Sets the 'first' variable to true since it is the first click.
        cframe = old_pos * CFrame.new(12, 0, 0) -- Sets the CFrame the part will need to reach. (In this case straight up relative to the Curtain's old position.
    else -- If it's not the first click then it will go here.
        first = false; -- Sets the 'first' variable back to false since it's the second click.
        cframe = old_pos; -- Sets the CFrame back to it's initial position so that it can go back to where it started from.
    end -- end for the if statement to check if it's the first click or second click.

    local goal = {CFrame = cframe}; -- Variable for the goal now that we know what CFrame the part will need to go to.

    local tween = tween_service:Create(curtain, info, goal); -- The whole tween of the Curtain, including the instance, info and goal the part is trying to reach.

    tween:Play(); -- Plays the Tween animation on the part
end -- end for the function.

detector.MouseClick:Connect(move_part); -- Connects the function to the MouseClick() event of the ClickDetector.