how to make a draggable model?

I'm not sure how you would do it on a model but if you want a literal drag-able brick, here you go.

1. First off, you would need a tool.
2. Then Insert a script and a Local Script.
3. After you've done that, Insert these scripts into the tool.

Script:

wait()
local check = script.Part2
local part1 = script.Part1.Value
local part2 = script.Part2.Value
local parent = script.Par.Value
local color = script.Color
local line = Instance.new("Part")
line.TopSurface = 0
line.BottomSurface = 0
line.Reflectance = .5
line.Name = "Laser"
line.Locked = true
line.CanCollide = false
line.Anchored = true
line.formFactor = 0
line.Size = Vector3.new(1,1,1)
local mesh = Instance.new("BlockMesh")
mesh.Parent = line
while true do
    if (check.Value==nil) then break end
    if (part1==nil or part2==nil or parent==nil) then break end
    if (part1.Parent==nil or part2.Parent==nil) then break end
    if (parent.Parent==nil) then break end
    local lv = CFrame.new(part1.Position,part2.Position)
    local dist = (part1.Position-part2.Position).magnitude
    line.Parent = parent
    line.BrickColor = color.Value.BrickColor
    line.Reflectance = color.Value.Reflectance
    line.Transparency = color.Value.Transparency
    line.CFrame = CFrame.new(part1.Position+lv.lookVector*dist/2)
    line.CFrame = CFrame.new(line.Position,part2.Position)
    mesh.Scale = Vector3.new(.25,.25,dist)
    wait()
end
line:remove()
script:remove() 

LocalScript:

wait() 
tool = script.Parent
lineconnect = tool.LineConnect
object = nil
mousedown = false
found = false
BP = Instance.new("BodyPosition")
BP.maxForce = Vector3.new(math.huge*math.huge,math.huge*math.huge,math.huge*math.huge) --pwns everyone elses bodyposition
BP.P = BP.P*8 --faster movement. less bounceback.
dist = nil
point = Instance.new("Part")
point.Locked = true
point.Anchored = true
point.formFactor = 0
point.Shape = 0
point.BrickColor = BrickColor.Black() 
point.Size = Vector3.new(1,1,1)
point.CanCollide = false
local mesh = Instance.new("SpecialMesh")
mesh.MeshType = "Sphere"
mesh.Scale = Vector3.new(.7,.7,.7)
mesh.Parent = point
handle = tool.Handle
front = tool.Handle
color = tool.Handle
objval = nil
local hooked = false 
local hookBP = BP:clone() 
hookBP.maxForce = Vector3.new(30000,30000,30000) 

function LineConnect(part1,part2,parent)
    local p1 = Instance.new("ObjectValue")
    p1.Value = part1
    p1.Name = "Part1"
    local p2 = Instance.new("ObjectValue")
    p2.Value = part2
    p2.Name = "Part2"
    local par = Instance.new("ObjectValue")
    par.Value = parent
    par.Name = "Par"
    local col = Instance.new("ObjectValue")
    col.Value = color
    col.Name = "Color"
    local s = lineconnect:clone()
    s.Disabled = false
    p1.Parent = s
    p2.Parent = s
    par.Parent = s
    col.Parent = s
    s.Parent = workspace
    if (part2==object) then
        objval = p2
    end
end

function onButton1Down(mouse)
    if (mousedown==true) then return end
    mousedown = true
    coroutine.resume(coroutine.create(function()
        local p = point:clone()
        p.Parent = tool
        LineConnect(front,p,workspace)
        while (mousedown==true) do
            p.Parent = tool
            if (object==nil) then
                if (mouse.Target==nil) then
                    local lv = CFrame.new(front.Position,mouse.Hit.p)
                    p.CFrame = CFrame.new(front.Position+(lv.lookVector*1000))
                else
                    p.CFrame = CFrame.new(mouse.Hit.p)
                end
            else
                LineConnect(front,object,workspace)
                break
            end
            wait()
        end
        p:remove()
    end))
    while (mousedown==true) do
        if (mouse.Target~=nil) then
            local t = mouse.Target
            if (t.Anchored==false) then
                object = t
                dist = (object.Position-front.Position).magnitude
                break
            end
        end
        wait()
    end
    while (mousedown==true) do
        if (object.Parent==nil) then break end
        local lv = CFrame.new(front.Position,mouse.Hit.p)
        BP.Parent = object
        BP.position = front.Position+lv.lookVector*dist
        wait()
    end
    BP:remove()
    object = nil
    objval.Value = nil
end

function onKeyDown(key,mouse) 
    local key = key:lower() 
    local yesh = false 
    if (key=="q") then 
        if (dist>=5) then 
            dist = dist-5 
        end 
    end 
    if key == "l" then 
    if (object==nil) then return end 
    for _,v in pairs(object:children()) do 
    if v.className == "BodyGyro" then 
    return nil 
    end 
    end 
    BG = Instance.new("BodyGyro") 
    BG.maxTorque = Vector3.new(math.huge,math.huge,math.huge) 
    BG.cframe = CFrame.new(object.CFrame.p) 
    BG.Parent = object 
    repeat wait() until(object.CFrame == CFrame.new(object.CFrame.p)) 
    BG.Parent = nil 
    if (object==nil) then return end 
    for _,v in pairs(object:children()) do 
    if v.className == "BodyGyro" then 
    v.Parent = nil 
    end 
    end 
    object.Velocity = Vector3.new(0,0,0) 
    object.RotVelocity = Vector3.new(0,0,0) 
    end 
    if (key=="") then
        dist = dist+5
    end
    if (string.byte(key)==27) then 
        if (object==nil) then return end
        local e = Instance.new("Explosion")
        e.Parent = workspace
        e.Position = object.Position
        color.BrickColor = BrickColor.Black()
        point.BrickColor = BrickColor.White() 
        wait(.48)
        color.BrickColor = BrickColor.White() 
        point.BrickColor = BrickColor.Black() 
    end
    if (key=="") then 
        if not hooked then 
        if (object==nil) then return end 
        hooked = true 
        hookBP.position = object.Position 
        if tool.Parent:findFirstChild("Torso") then 
        hookBP.Parent = tool.Parent.Torso 
        if dist ~= (object.Size.x+object.Size.y+object.Size.z)+5 then 
        dist = (object.Size.x+object.Size.y+object.Size.z)+5 
        end 
        end 
        else 
        hooked = false 
        hookBP.Parent = nil 
        end 
    end 
    if (key=="") then 
        if (object==nil) then return end 
        color.BrickColor = BrickColor.new(104) 
        point.BrickColor = BrickColor.new(11) 
        object.Parent = nil 
        wait(.48) 
        color.BrickColor = BrickColor.White() 
        point.BrickColor = BrickColor.Black() 
    end 
    if (key=="c") then 
    if (object==nil) then return end 
    local New = object:clone() 
    New.Parent = object.Parent 
    for _,v in pairs(New:children()) do 
    if v.className == "BodyPosition" or v.className == "BodyGyro" then 
    v.Parent = nil 
    end 
    end 
    object = New 
    mousedown = false 
    mousedown = true 
    LineConnect(front,object,workspace) 
        while (mousedown==true) do
        if (object.Parent==nil) then break end
        local lv = CFrame.new(front.Position,mouse.Hit.p)
        BP.Parent = object
        BP.position = front.Position+lv.lookVector*dist
        wait()
    end
    BP:remove()
    object = nil
    objval.Value = nil
    end 
    if (key=="") then 
        local Cube = Instance.new("Part") 
        Cube.Locked = true 
        Cube.Size = Vector3.new(4,4,4) 
        Cube.formFactor = 0 
        Cube.TopSurface = 0 
        Cube.BottomSurface = 0 
        Cube.Name = "WeightedStorageCube" 
        Cube.Parent = workspace 
        Cube.CFrame = CFrame.new(mouse.Hit.p) + Vector3.new(0,2,0) 
        for i = 0,5 do 
            local Decal = Instance.new("Decal") 
            Decal.Texture = "http://www.roblox.com/asset/?id=2662260" 
            Decal.Face = i 
            Decal.Name = "WeightedStorageCubeDecal" 
            Decal.Parent = Cube 
        end 
    end 
    if (key=="") then 
        if dist ~= 15 then 
            dist = 15 
        end 
    end 
end

function onEquipped(mouse)
    local keymouse = mouse
    local char = tool.Parent
    human = char.Humanoid
    human.Changed:connect(function() if (human.Health==0) then mousedown = false BP:remove() point:remove() tool:remove() end end)
    mouse.Button1Down:connect(function() onButton1Down(mouse) end)
    mouse.Button1Up:connect(function() mousedown = false end)
    mouse.KeyDown:connect(function(key) onKeyDown(key,mouse) end)
    mouse.Icon = "rbxasset://textures\\GunCursor.png"
end

tool.Equipped:connect(onEquipped)