Any way to change the way a part's size gets bigger?

In a script I was tweening a cylinder part and saw how it increased in size from the center. It starts off as a flat circle, and then I want it to rise up to the cylinder shape, but when I do that, I noticed that it increases it's size from the center of the part, just as how CFrame and Positions are like that. Is there any way I can change the part from increasing in size by starting from the center, and instead have it go from being flat to rising up to being tall?

The script I tried:

local TS = game:GetService("TweenService")


game.ReplicatedStorage.ShadowMagic.ShadowR.OnServerEvent:Connect(function(plr)

    local Cylinder = bottom:Clone()
    Cylinder.Size = Vector3.new(0.5,20,20)
    Cylinder.Position = plr.Character.Torso.Position + Vector3.new(0,-2,0)
    Cylinder.Anchored = true
    Cylinder.CanCollide = false
    Cylinder.Transparency = 0.2
    Cylinder.Material = "SmoothPlastic"
    Cylinder.Parent = game.Workspace
    Cylinder.Name = "ShadCyl"

    local CylinderTI = TweenInfo.new(
        1.2,
        Enum.EasingStyle.Linear,
        Enum.EasingDirection.Out,
        0,
        false,
        0



    )   

    local CylinderProperties = {
        Size = Vector3.new(40,15,15),
        Transparency = 1
    }

    local CylinderTween = TS:Create(Cylinder,CylinderTI,CylinderProperties)
    CylinderTween:Play()
end)