Custom Reference plane that matches curvature of roof in REVIT

I have a roof in REVIT that creates a curved geometry and I found that it is possible to use Dynamo to create a custom reference plane that matches the curvature of the roof to place beams. I have yet to find a source that takes me step by step to do that. Please Help and thank you!

Can you post a screenshot or dyn of what you have attempted thus far?

You may not need to use reference planes: Beams created by Geometry Intersect of curved roof

I want to be able to attach beams to the underside of this roof and I believe the only way of doing that is creating a custom, curved reference plane

I see.

The link should be a good read, it also includes the link to the related AU presentation that goes into depth.