What is the best way to allow sub-site admins to copy content from main site

So I have just about everything in place that I need to set up my multisite website plan. The one big hole I have is that I will have a master list media content (custom post types) that I want to give access to sub-site admins to import into their site and add custom excerpts, titles, and keywords. I have the multisite setup to throttle posts per day based on membership level. Is there a good existing method for accomplishing this or will I need to build a custom plugin?

So for my findings are that I will just need to build the plugin but thought I would ask as I am sure I am not the only one who has needed something like this.