When you add custom menu items (on page 1), you need to consider the following elements:
The scope level and name
The menu label
The parent menu
The menu tree
In an application, menus are arranged in a hierarchical order called the menu tree. N4 has a distinct menu tree for each available scope. Accordingly, depending on the scope level, different menus are available to a user.
Following common scoping rules (on page 1), if two menu items with the same name and parent menu exist at two different scope levels, and if one scope is a parent of the other, then the one value overrides the other, independent of the nodes' position within the tree.
The following figure illustrates this concept.