Get your taxes done using TurboTax

The simplest answer to this question is to just LOOK at the Sch 1 line 8b ... this is the ONLY info the IRS is sent when you efile  no matter how many W-2G forms you enter in the program.   Entering in all those forms are for YOUR use only  so if you can add up all the winnings yourself then you can simply make ONE entry in the program ... just skip the W-2G entry screen by saying NO and on the next screen you can enter just the total. 

The IRS computer adds up all the winnings from the W-2G forms they also get from the issuers  and will be looking for that amount to be on line 8b.   This is just the brass tacks of the situation.   Now if you want to enter all those individual forms because you need the program to do the math for you then go right ahead and waste all that time if that will make you happy but it is not required.   30 years in the business and I have never entered in a W-2G form UNLESS  it had fed/state withholding on it ... that is the only time entering it in any tax program makes sense and even then you can still just make one W-2G entry with the combined totals.