For future projects, I would recommend looking into Top Down Assembly Modeling (This is covered in the Assembly class with a VAR, but you should be able to find a ton of information here in the forums.)
If you really want to take it to the next level, I would highly recommend looking into using Skeleton Sketch Part Method.
I don't think he needs to worry about skeleton sketches at this point especially with the basic knowledge of the software - maybe later but I think at this point it will just add to confuse. Just simply move forward using assembly for more than one part and reference for the time being.
Anyway for the time being to fix the current problem -
Top drop down menus
Insert - features - save bodies
Select the body and give it a name. You need administration rights often to do this set on your computer.
Create new part then from to top menu
Insert - part
Select the original file and insert.
Next delete the solids you don't want.
(now this seems more drawn out than the first method but there is a bug in SW that means any appearance don't work on rebuilds with the 'save bodies' method)
The saved out files will automatically update in future from the original file it was saved from. So in this instance when you need to do mods work on the original file. Unfortunately doing tool design you are always faced with multi body parts when you do all the splits, inserts side actions.
There is an option called combine in (Insert -> Features). You can use it as one of the option else you can use split. But according to your description, combine option will works good.
Naga Ranjithkumar A
Thank you all for the responses! Now I just need to find time to explore these methods.
Jason K Olson~