If the parts are already modeled (and for example integrated into MEPs) it could be more interesting to use fractionation and then removal of the body or the rough method with material removals. The problem with splitting is that you'll have to create more shots. (Everything is done via configurations as proposed by III, let's say it's variants)
You can use the split function (Insert Menu, Function, Split), then select one or more planes (separation plane) and a body. This will create the different pieces for you.