Tweening working with Vector3, but not CFrame?

So I made myself a custom part tweening engine. Which works (for the most part), but I want to get it to work with CFrame so the block can clip through objects, however, I can't seem to make it CFrame comaptible, It'll keep returning errors like "CFrame expected, got Vector3" or "Got Table" etc, etc.

This is the script.

local parttomove = script.Parent
local parttomoveto = script.Parent.Parent.pto

function move()
    local tar = parttomoveto.Position
    local cur = parttomove.Position

    for i = 1,100 do
        wait()
        parttomove.Position = cur + (tar-cur) * 0.1
        cur = parttomove.Position
    end
end


script.Parent.ClickDetector.MouseClick:connect(move)