I'm not quite sure how to explain this - I want to create a body that has some elements that will be subtracted when it's joined with another object, and some elements that will be combined. Probably better explained in a video:
https://knowledge.autodesk.com/community/screencast/f4df1fd6-3a38-48b9-98d7-44fd9bd4cb73
(Originally posted this in the wrong place, I don't see a way to just move posts between areas)
