Don’t explode the components. Just open the parent component and make the ones that need to be modified unique. As John wrote, if you want to change only the width of the drawer, make the front bottom and back unique but leave the sides alone.
Here’s an example in which I made the drawer deeper front to back. I made the drawer component, which is a copy of the middle drawer component unique, then opened that component for editing so I could select the sides and bottom and make them unique as well. then it’s a simple matter to move what needs to be moved to change the size of the drawer.