Welcome to the forum, short answer straight away in my opinion especially for furniture design where copies of the same parts often happen would be to make those suggested components into a component and not a group. This is known better as nesting.
I myself had the same idea as you what seems a long time ago. I wanted to make several components stay together as an assembly, so in the haste of the moment I made them a group and then carried on in that fashion making groups for a long time. I never really stopped to think I were simply working too hard and creating problems as I did so. You see if you copy this group containing components and then decide to add something to it or move components around within it, the changes won’t be reflected in the copied one and you’ll then have to make the whole group copy again and move it back into position, it becomes very tiresome and massively prone to errors. On the other hand when you use a component to nest the other components together, any moves/additions you make to one of these instances will be reflected in the others automatically, it makes for a much easier experience. I just didn’t see the benefit at the time.
It’s a long running debate the whole component/group thing but I only use components now after sound advice from forum members here. I quickly saw the benefit of only using components and switched my game up immediately. The only benefit of using a group in my opinion is they are created quicker and don’t get hung up in the “in model” components when deleted.
Groups have no connection between copied instances so if you change one instance the changes will not be reflected in copied instances of that group. Sometimes you may want this behaviour using components of course, you can right click the top level “nest” component you make to hold the assembly and choose “make unique” from the context menu to detach its connection from the other copied instances. The components within that are nested still have the connection throughout the model of course.
There are many other benefits to using components over groups including setting up the model for any shop drawings you should require, enabling constant changes without the hassle of trying to figure out if you changed all the groups in the process.
Sorry to detract from your simple question but I saw your post and alarm bells starting going off in my head when I saw it, so I thought I’d give my thoughts on it in the hope it might help you. I’ve tried to explain clearly as I can but if it’s all a bit of a muddle for you, you could upload a sample SKP file to get some better information.