To enter the W-2G or other documents For your Gambling winnings--Go to Federal>Wages & Income>Less Common Income>Gambling Winnings
You can enter your winnings, and then keep clicking through the interview to enter gambling losses.
https://www.irs.gov/help/ita/how-do-i-claim-my-gambling-winnings-and-or-losses
Losses are an itemized deduction. If you do not have enough itemized deductions to exceed your standard deduction, your losses will have no effect.
https://blog.turbotax.intuit.com/income-and-investments/how-are-gambling-winnings-taxed-8891/
https://ttlc.intuit.com/questions/1900352-can-i-deduct-my-gambling-losses
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**