You can do so by modifying the sass with different styles for odd and even rows. Use the selector for nth-child(even) and nth-child(odd) to distinguish between the two. For a start:
tr:nth-child(even) {text-align: left} tr:nth-child(odd) {text-align: right}
and figure out what styling-additions you need to apply to get it conform your requirement.
Yes sure in a menu or in the navigation you have the option for a subitem.
What Maarten said is the easiest way to add a submenu
and Tim has an easy way to style the text like that.
also popping this here:
in atlas its really easy to do some basic styling to the submenu