While elements can tilt in plan, to make a tilted wall that retains the same editability as a wall element - in particular interaction with doors and windows, one creates a really thick wall and trims it down using the Solid Element Operation and roof planes or other elements as cutters.
For less-sculptural solutions: A battered wall or a canted wall element can be added to the faces of a wall - find these tools under Extras>Accessories>Wall Accessories.
These tools perform operations in plan view on selected walls.
Dwight Atkinson