CFrame to move model relative to Center point (required ? mark here)

I am trying to use CFrame to animate some models. I have a block called Center that is continuously moving. I want to move the Model relative to Center's movement. This is the code I have (but the model disappears when I run the function)

How do I make this work right? Thanks.

function TransformOffset(model, center, new) -- new is irrelevant, can be used as a Rotation matrix but I dont want to change angles in this case

        for _,v in pairs(model)do

            if v:IsA("BasePart")or v:IsA("UnionOperation") then

                v.CFrame=v.CFrame*center

            end

            --TransformModel(v,center,new)

        end

end