Appending existing dialog file, ...another noobish question from half-experienced modder Options

[Valiant]

Hi folks,

I would have another stupid question (comparing to time I already spent in IE forums). How can I append existing dialog file to suit my needs? Ok, to be clear, here it is. Let´s say I have an NPC and I want it to start talking with captain Brega (or whatever was his name) near Athkatla Bridge District Gate (the one who was glad when you finished tanner quest). How should I proceed with both custom NPC dialog file and captain´s dialog file. Is there anything like tutorial somewhere?? I wasn´t able to find it in Tutorial section, so I´m asking here. Short tut would be nice if provided...

I never need to know this stuff, because I always worked with dialogs NPC or game character <-> PC...

Thanks