Blogory is a tree of objects, soon to be a graph. Bloggers operate on nodes of the graph. If you have permission on a branch of the tree you can add group categories, external links, postings, and soon internal links to that branch of the tree. The interface to a node on the graph is the ZMI.
The ZMI is a list of objects in a node. You can see the id of the object, its title, and possibly size, cretion date, and number of objects it contains. You can rename objects, you can move objects by cutting and pasting them in another node, and you can sometimes delete them.
You cannot copy and paste objects, that would make no sense from a content perspective to have two copies of the same object.