Not quite right ... the gambling winnings must be reported as income and only the losses (up to the amount of winnings) can be used on the Sch A which is not a $ for $ reduction and is not done on the form 1040 "above the line". You are not allowed to net the losses against the winnings and only report the difference on the form 1040 and you can never deduct more loss than you reported in gains.
In the TT program, when you enter the gambling winnings in the W-2G section (even if you have no W-2G to enter) you are asked for the total of the winnings and on the next screen the total of the losses ... the program will put them in the correct places on your return.
Do not also enter the 1099-K if you got one for the gambling if you already entered the gambling winnings somewhere else in the return. Do not enter that amount twice unless you like paying more in taxes than required.
