Add subtitles to dvd menu - core questions

[Arcanis01]

First of all hello to everyone who is reading this.

I have downloaded several DVD movies with menus from the Internet (torrent). I'd like to add my subtitles to them before I burn them on a DVD media.
Is it possible to add custom subtitles (srt) on DVD subtitle menu so that a user can choose them? How complicated is that and what is the chance of success?
Which software do I need?

Thanx in advance.

[tinker]

Read this thread
https://forum.videohelp.com/topic360086.html

[jman98]

It's very easy to add subtitles to a DVD, but you if want to make any changes to a menu, that is very difficult to do. When I have had to do this I have either replaced an existing subtitle with an English one and just left the original menu with the now "wrong" label for the now English subtitle or just added subs to an existing DVD so they couldn't be reached via a menu but could be turned on by remote control. Again, if you don't need/want to change menus, it's really easy to add new subtitles to a DVD and tinker's link will work.

[Arcanis01]

Ah, so it is complicate to edit dvd menu thanx for the answer. Oh and I finally got it what it means to add subtitles on dvd without changing the menu
silly me
Yeah I have followed the guide above but it always shows some error

cheers