Mmm yes.. and no.

Depends.

Do you want the door to be functional and to open and close?

If you want JUST looks then a simple texture map may be enough.

If you want it to be a modeled surface detail then well it gets a little more complicated. It may have been a better idea to have the ceiling of it to be pulled a bit more down so the little rim you get at the top bit would be one surface. And then a surface for the parts before the door, a surface for the door and another from the door to the rear.

Another option would be to insert two isopams right where you want this detail... and then pull and push the CV's until you get the desired effect.

I just chekked the bit on the link. What he has done there is that he has set a fillet on two seperate surfaces as far as I can see. The difficulty you are having is that you have one surface. You always have an option to dulicate a surface curve and do a fillet from that. Just select an ISopam and move it to where you want and duplicate it.
In any case no changes will be visible fro mthe outside unless you have some sort of indentation there.

Hope I got it right this time