As we’ve been registering more and more custom post types in WordPress over the last couple of years, we’ve found that we often need to relate them together in meaningful ways. Randy Hoyt will explore in detail one particular kind of a relationship, a subordinate relationship where posts of one type are children of another type. WordPress core uses this relationship in places, as do a number of popular plugins, and Randy will cover code you can use to take advantage of this kind of relationship in your work.