Charles. This may definitely work for small changes to “look” OK. But I would worry that the frames, handles and other details would be scaled incorrectly. If you have a 48" long cabinet made 125% longer, the stiles will end up 125% wider whereas you had designed to be 1 1/2" wide stiles exactly (they would end up about 1 7/8" wide). Round knobs would become ovoid. That’s why I would edit the cabinet box component and select the end panel and stile geometry and move it.
(It can be quite a number of steps, the more components you have, and that’s why some people use cabinetry plugins. For my work the above method is faster than buying and learning software that may or may not fit my purpose.)
This is also why it may be a good idea to make “massing” models to get the cabinet sizes right before adding detail.