Go to the connections window. One of the connections on the left side will be: "track (insert number here) end jump" e.g. if you're working with track 1 the connection will be: "track 1 end jump." Just connect that to the menu (you've already created) of your choice on the right side of the connections window. Now, when the track gets to the end it will stop and you'll be presented with the DVD menu screen you've connected it to. Bear in mind that I've never used anything other than DVDSP2, but I'm sure it's very similar in more recent versions.