Autodesk Revit Architecture

[#1]

I don't know if this is possible, but can a door family read the rating of a wall and also have it read in the door schedule? I have tried applying a shared parameter on the door family and adding it in the project. I am not understanding how I can link the two together. Please help!

[#2]

No. That relation wall-door in regards to the fire rating is not available through parameters in the way that you have described.  A common solution is to handle this via visibility graphics, as a way to have a visual control of the fire rated values of doors and walls.

[#3]

It is possible via API tools but it is all custom programming.  There is no "out of the box" solution for this.  There is a video of an AU presentation showing how this can be done at this blog site.

http://jasongrant.squarespace.com/jason-grant-blog/week/2009-12-06-to-2009-12-12

The part talking about what they did in the API to read the fire rating of the host wall and apply a value to the door is at about 38 minutes into the video.