Is there a way to increase a specific point on an axis?

I’m making a script that makes two parts close like doors, but whenever I increase their size, the size increases on all of its axis points. This is annoying, as it makes the left part of the door increase through the wall.

If you don’t understand what I mean by “axis point”, I’m referring to the sub axis points on an axis.

Like the sub-axes of X would be (X+ & X-), or in ROBLOX’s case, an X axis on the left to size up that specific parts length, and one on the right.