Your first play item has to be a script that turns off subititles and then jumps to your track or menu.
Create a script (Add script button on the button bar). Make sure the disc's first play is set to this script. Replace the default first command of the script ("nop"

with "Set system stream". When you add that command, it will let you pick "subtitle" as an option. Set it to your subtitle stream (#1, most likely) but with the "View" checkbox turned off.
That will be enough to turn off subtitles. Now you want to jump to your track. Press the + button in the script editor to add a new command, and in the Inspector select "Jump". Set the destination to your track (or menu).
In the menu editor, you should see these two commands:
1. Set System Stream St(Subtitle Stream 1) (Off)
2. Jump YourTrackName
Many people may expect a subtitle menu, at least to turn them on or off.
Adolfo Rozenfeld
Buenos Aires - Argentina
www.adolforozenfeld.com