To understand how to develop parametric door families, start by watching the hour long Autodesk University video AB110-1P (All in the Family - Creating Parametric Parts in Revit Architecture).
hello, the process is long, because the generation is the most complex families in Revit, the process is from that open a temple family, and selections door, and by a struction you can generate the board.
to modify a door is necessary to enter the family editor and modify the parameters.
I recommend you take a course, is not easy.