I am required to do a detail cut list for the project I am working, I am designing a meat rail.

I used structural member when creating the rail, when i go into the drawing section and click "bodies" in the reference section to select each part individually as it goes different directions and angles, it will only let me select it as a whole. is there a way I could turn that off as each line was drawn as an individual sketch  so that I can do each part measurement separately?