Switching a Built-in Type Parameter to an Instance Parameter

Another nice workaround by Philip Chan - if you want to change one of Revit's built-in Type Parameters (derived from a Family Template, such as Door Fire Rating) to an Instance Parameter, you just have to take the Family on a little round trip to a more flexible Family Category.

For example:

1. New Door based on Door Family Template
2. Switch to Generic Model Type
3. Change built-in Type Parameter for Fire Rating to Instance
4. Switch back to Door Category

You can read Philip's whole post at:
Phil-osophy in BIM: Hacking System Parameters in Door Family