So I need to build two mating bodies.  The first part is a panel with a bunch of holes in it.  The second part is a panel with a bunch of bosses in it that slip into the holes of the first panel.   I created the first body and saved it as part#1.  I opened a new file, inserted part#1 into that file, and created a second part (that synchs/mates w/ the holes in the first).  Then, I tried to hide the first part so that I could see my second part by itself.  However, when I hid part#1, part#2 disppeared as well.  What am I doing wrong...should I have approached the development of part#2 in some otehr way??  If no, is there a way to view part#2 w/o part#1?  Also, can I save out the second part into its own separate file that does not contain part#1?