The procedure is simple, and is under:
Diagnostics > "Model Year" > Omega-B > F0-Engine > Y32XE > Confirm
From there is where I'm vague, as I don't have an Omega to confirm, and its been ages since I did it. As said, its somethign like Variant Config, probably under Programming, but could be under Additional Functions.
When on the right page, it will show a list of available options, which you just adjust as required, and then hit the Program soft button.
However, as said before, your Tech2 will need authorisation for this specific vehicle via TIS2000 or GlobalTIS. Given your Engine ECU might have wrong VIN (which you can adjust if you so wish), *IF* the ABS needs adjusting (can't remember to be honest), that might need Tech2 reauthorising again.
ABS (If it has gearbox setting in its variant config) is similar process, but is under Chassis > ABS/TC instead of Engine > Y32XE
MID/GID/CID should technically be done, but not essential. That just needs the Variant Config code looking up on TIS2000/GlobalTIS. No authroisation needed for that.