I've just finished my first Blu-ray to DVD encode and it looks really fine. What I've been stuck with for days is as to how I add some additional content that has been stripped from the DVD. The menu buttons are still intact so what I'm trying to achieve is to "simply" insert the theatrical trailer of the movie along with 4 preview trailers and then assign them to the corresponding menu buttons. To make it complete I would like the previews to be played after inserting the DVD, just like it was designed.

I've read dozens of guides and pages of advice how to do this with PGCEdit, DVDremake and so on, but when it comes to the command editor, all I see is hieroglyphs. I think what this guy here tried to do is similar to my goal, but again all the tips are cryptic to me:

https://forum.videohelp.com/threads/335754-Editing-the-commands-of-the-buttons-on-the-DVD-menu

If anyone be so kind to give me insight into his authoring knowledge it would be greatly appreciated.