The income should have ended up on Form 511-NR-1 which is on pages A-H and that will give you the opportunity to show the gambling winnings as Oklahoma income.  The first page of the OK 511 NR will show your Oklahoma income and your total income but will not tax it.

I  just noticed that you are using Pro Connect and my answer is based on Pro Series Professional so I hope it is still of benefit.

Another Former All Star