Boolean is making different parts of my geometry into one, how do i avoid this
 

Hi

I am doing an external aerodynamics simulation over an UAV. I have separate bodies named as wing, fuselage etc... in my geometry, so to avoid my mesh inside the aircraft body I am doing a Boolean operation but the problem is if I do a Boolean it makes all my bodies in my geometry named above are merged into one body but I need those bodies to be present so that i can only mesh a particular body one by one for example meshing only wing body and suppressing other bodies. The reason I need these separate bodies is because I can see no of elements only on particular bodies for example only on wing,but Boolean is making everything as a one body