Create a relationship between two custom post types?

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WordPress by itself doesn’t provide a built-in way to handle many-to-many relationships, you have two general ways of creating such relationship:

  1. Using a plugin

    The best plugin for this purpose is Posts 2 Posts by Scribu which is not maintained currently, but It’s bug-less and won’t introduce any problems in a long shot. But please be aware that this plugin requires some coding to get it up and ready and has to be active to work.

  2. Coding it yourself

    I’m not against the above plugin but, If you’re not going to have only one relationship of this type then, I highly recommend you to develop a basic many-to-many relationship for it. The only reason for this is the age of plugin and its small community.