asp.net mvc 4 - Splitting an Existing MVC4 app into Areas -

we have mvc4 app picking significant new features. split project areas in order separate new functional areas old ones. steps know are:

1. create area (right-click on project -> add -> area)
2. drag models, controllers, , views didn't come microsoft out of "root" area & appropriate folders within new area.
3. create additional areas other major features want add.

what else needs done here? i'm guessing both routeconfig.cs , various arearegistration.cs files need changes, if want redirect actions of controllers still residing @ root level.

thanks, b