This also answers: How can I consolidate my Axiom menu?
What displays on your Axiom menu, is determined by the contents of a simple text file named aximenu.cfg. The aximenu.cfg can be modified in various ways to customize your Axiom menu, but in this article, we’ll show how to create submenus.
The default location for the aximenu.cfg is C:\Program Files (x86}\Axiom\V8\aximenu\
Submenus allow you to shorten your Axiom menu and categorize your listed Axiom software applications.
The differences between the two menus above are produced by changes made in the aximenu.cfg file. These changes are simple and easy to make. See the example below showing contents of the default aximenu.cfg and then the modified version of aximenu.cfg.
After saving the changes, restart MicroStation to see your updated menu.