How do I Increment TweenPosition?

Lets say you move a bunch of GUI's at once with tween position. In the middle of their move, you want to move them just a bit further than the target of their move.

What is the most efficient way to do this?

To clarify: TweenPosition can be overridden midway through. Lets say you override the tweenPosition of a whole bunch of GUI's, so that they move to a further/lesser place than their original target of the first tweenPosition.

I'd imaging making a table of target UDim2's may be in order...