Hi @Littlesheep ,
It is just an organization method for yourself, so however you do it is up to you, but for instance:
You can ‘nest’ Collections and if you make a UV Collection for the top cover and one for the chest lower and put them inside those Collections, you can Move the unwrapped parts inside the appropriate UV Collections (and even Hide those Collections) and when everything is Unwrapped, you can Delete those UV Collections and everything will be back in their correct place.
Something like this:

But preferably without typos 😉