The problem I'm having is if you have over the Level 1c and then Level 1b the submenu grows in width. The attached images may help to explain better what is happening.
Thanks for replay. Its working but, In one root in your example itself am add one sub menu to the root for configuration. Then the submenu width will execed the width size it should not over the root menu width. image is attached to this below.
In the picture the right side of the sub menu should inside the root menu..
Thanks
Prathap