Thanks! I don't think that's exactly the solution I'm looking for - as that user wants //blog1/events/event1 to appear as //blog2/events/event1 when viewed from blog 2 - some content, different urls.
Custom post Type: Portfolio created by Meta box
to be available as a Custom Post Type in all subsites
but NOT copying the content.
So blog1.domain.com/showcase/post-created-in-blog-1 and blog2.domain.com/showcase/post-created-in-blog-2, and so on. Each site would have it's own posts. I'm just looking to populate the Custom post Type on ALL subsites with the metaboxes (not the content)
I am not a Metabox developer but a customer. I have been wanting something similar for so long. However, there are limited solutions for us multisite users. While it is not ideal, the best solution I have found is the broadcast plugin. It doesn't have direct metabox.io support, but it works generally for all custom post types I have created with Metabox thanks to their awesome code.