Is your headwall part of your assembly or just projected block? If projected, I think you can create a block rotated the way you want it and use it in Section View. You would need to edit Structure Style and change the teh existing structure with your new block.
Almas Suljevic Product Support Specialist Autodesk Global Subscription and Support Autodesk, Inc. Please click on "Accept as Solution" if post helped you resolve the issue.