Change multiple wall orientations in Revit

In Revit Building or Revit Structure, a user can flip the wall orientation to adjust what is exterior or interior. To do this, a user must select the existing wall and choose the blue double arrows to change the orientation. There are times when the entire set of walls is drawn "backwards". To flip all of the walls in one command, the user must:

1. Select or highlight all the walls that need to be flipped.
2. Press the SPACE bar on the keyboard.

By pressing the SPACE bar, all the walls will flip simultaneously.

Comments

[SmartAlx]

This will only reverse a wall, it won't change the reference line from exterior to interior or vice-versa. You have to recreate those walls, AFAIK.