Re: Add a new parameter

I didn't test, but it looked reasonable:

Category wall = doc.Settings.Categories.get_Item(BuiltInCategory.OST_Walls);
Category door = doc.Settings.Categories.get_Item(BuiltInCategory.OST_Doors);
CategorySet cats1 = app.Create.NewCategorySet();
cats1.Insert(wall);
cats1.Insert(door);
TypeBinding binding = app.Create.NewTypeBinding(cats1);

And with the code in the BuildingCoder, you can find out if you can do that.

I also found this one here. Maybe it helps.

http://spiderinnet.typepad.com/blog/2011/05/parameter-of-revit-api-31-create-project-parameter.html

Christian