You can adjust the sub menu levels like this by adjusting the padding on the item within the edit design interface. When you edit design choose the level of the menu you are working with and click on the item tab. In here you can uncheck the box that applies equal margin to all then you can specify your own margins for left are right to get the submenu positioned just where you would like it. If you need to get it further to the left you can set a negative value for the left margin.
If you have any further questions about this please let us know and include any other details you can, a screen shot might be helpful.