Does the data in the new column need to be unique for each Door instance, or should it be the same for all instances of the same Door Type?
If it is type-based, would you want to add the data in the Door Families, so that it is already there when loaded into a project?
For type-based data that should be entered in the families, create a new shared parameter, and add it to your Door Families and to your project. Then it will be available to be added as a column in your Schedule.
If all of the data entry will be in the project file (because it will vary from project to project, so there is no need to have it in the family) and you do not need to show this data in a Tag, you can just add a project parameter to your project that applies to Doors. (That could be a shared parameter as well, but would not need to be if you will not need to show it in a Tag.)
David Koch
AutoCAD Architecture and Revit User
Blog | LinkedIn
