You could define the X,Y,H,W of the new region based on the old region with something like this:
oldRegion = SomeRegionYouAlreadyDefined
oldRegion.highlight(2)
newRegion = Region((oldRegion.getX() + 20), (oldRegion.getY() + 20), (oldRegion.getW() - 40), (oldRegion.getH() - 40))
newRegion.highlight(2)
Of course, you can remove the .highlight() lines. That's just for ease of seeing where your regions are.