If you want a text-only button on the main menu to navigate to a sub-menu, try this:
1. In MyDVD, click Change Menu Style in the menu window.
2. Scroll down and select a menu style that has text-only showing on the main menu. An example would be the Serenity style.
3. If you now select Menu>Add sub menu, you should get only a text button on the main menu screen that will be linked to the sub menu.
4. Modify the background picture, audio, text attributes, etc. on the main and sub menus as desired.
Hope that helped. If that is not what you are trying to do, post back with some additional details.