In simple terms if was trying to create a drawing as a set of a engine, hence adding new sheets as i was doing the engine block & heads; for example, though if i was going to use a piston that i had already done a drawing that was done & was an idependant drawing, how do i insert it into the set so i will show up down the bootom as an added sheet with a tab, so i can ultimately include this into a PDF complete folder of parts.