how to grab an object with the mouse?

I want to make a model move with the mouse but I do not know how I know just to make it take only one part I want it to take the whole model I tried with the primary part of the model more did not work. Please, can someone help me

local player= game.Players.LocalPlayer
local mouse = player:GetMouse()
local point 
local down


function clickObject()
 if mouse.Target ~= nil and mouse.Target.Name ~= "Baseplate" then
  point=mouse.Target
  mouse.TargetFilter = point
  down=true
 end
end

mouse.Button1Down:Connect(clickObject)

function moveMouse()
 if down and point then
  local posX, posY, posZ = mouse.Hit.X,mouse.Hit.Y,mouse.Hit.Z
  point.Position = Vector3.new(posX,posY,posZ)
 end
end

mouse.Move:Connect(moveMouse)

function mouseDown()
 down = false
 point = nil
 mouse.TargetFilter = nil
end

 mouse.Button1Up:Connect(mouseDown)

-- this was the script that I did more, I want to improve it so I do not get only parts, but the whole model

I edited, I stay like this but it did not work

local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()
local ModelPlacing = false
local Picked, PickedsOldParent
Mouse.TargetFilter = game.Workspace.CurrentCamera

function KeyDown()
    local Picked = Mouse.Target.Parent --Parent since we are trying with a model.
    --At this point you have to find out if Picked is a legit model to move. It may not be something what you want to move. Beware.

    PickedsOldParent = Picked.Parent
    Picked.Parent = game.Workspace.CurrentCamera
    ModelPlacing = true
end

function KeyUp()
    if Picked then
        Picked.Parent = PickedsOldParent
        Picked = nil
        --This is where you need to fire a RemoteEvent to make it FE compatible.
    end
    if ModelPlacing then
        ModelPlacing = false
    end
end

function MouseMove()
    if Picked and ModelPlacing then
        --First, let's get position.
        local Pos = Mouse.Hit.X,Mouse.Hit.Y,Mouse.Hit.Z

        --Then model's rotation in CFrame shape. For that, we need to substract position from CFrame.
        local RotCF = Picked.PrimaryPart.CFrame - Picked.PrimaryPart.CFrame.new(Pos)

        --Now time to get those together.
        Picked:SetPrimaryPartCFrame(CFrame.new() * CFrame.new(Pos))
        --Pos was Vector3, with CFrame.new, we turned it to CFrame position. RotCF was already a CFrame without a position.
    end
end

Mouse.Button1Down:Connect(KeyDown)
Mouse.Button1Up:Connect(KeyUp)
Mouse.Move:Connect(MouseMove)

Was this

local player= game.Players.LocalPlayer
local mouse = player:GetMouse()
local point 
local down


function clickObject()
 if mouse.Target ~= nil and mouse.Target.Name ~= "Baseplate" then
  point=mouse.Target
  mouse.TargetFilter = point
  down=true
 end
end

mouse.Button1Down:Connect(clickObject)

function moveMouse()
 if down and point then
  local posX, posY, posZ = mouse.Hit.X,mouse.Hit.Y,mouse.Hit.Z
  point.Position = Vector3.new(posX,posY,posZ)
 end
end

mouse.Move:Connect(moveMouse)

function mouseDown()
 down = false
 point = nil
 mouse.TargetFilter = nil
end

 mouse.Button1Up:Connect(mouseDown)

-- this was the script that I did more, I want to improve it so I do not get only parts, but the whole model