To play a single "Chapter", you can copy/paste a video onto your menu, and then for the new button, trim the video to only include the chapter you want.

Or... Depending on what sort of project you're doing, and If a potential but slight pause between segments isn't a problem, you can use separate video files, and use a playlist if/when you want to play every segment sequentially. It can be quicker (maybe easier?) to implement, but the scripting DVDA inserts to play one after another, added to the time for the player to load the next video, can cause a slight delay. IMHO it's not a big problem if you have a fade to black sort of scene change between segments, but referencing chapters/cells in a single video file is the more pro solution...

The only GOTCHA I've seen with playing individual chapters of a single file is that, depending on the encoder & player, if the chapter markers are located mid-scene [i.e. without a fade to black etc.] the player can show a bad frame or three at first when playing that chapter. I *think/assume* it has to do with the B &/or P frames, since joining segments with Cuttermaran or ProjectX avoids the problem, as does a fade to black at segment start/stop in Vegas when creating the mpg2.