Branch Managers manage a branch of the Blogory blog. They can edit any category, posting, internal or external link in their branch. Those changes also show up in the private versions of those objects. They can rearrange their branch of the tree by cutting and pasting objects. They cannot (yet), move objects to another branch of the tree.
A branch manager might have management permissions on one part of the tree, and blogger permissions on a different part of the tree.