I've done a little bit of research on whether you can enter all your winnings in lump sums or if you have to enter the W2G. I've found conflicting answers not only turbo tax community pages but also on other vendors as well. I'm looking for an answer from one of the Turbo Tax Experts. Some say you can do it, but it will cause the IRS to question your return.
https://ttlc.intuit.com/community/taxes/discussion/can-i-report-more-than-one-w2g-from-the-[product ...
https://ttlc.intuit.com/community/taxes/discussion/do-i-have-to-enter-72-different-w2-g-also-how-do-...
The IRS publishes e-file requirements for each tax year. According to their list of acceptable forms at My link, W-2G is limited to 30 copies.
Don't try to "combine" forms--matching information returns is what the IRS does best of all. And you may have noticed they are paying a LOT of attention to e-file requirements and preparer services lately.
While you can electronically file the return by consolidating similar winnings as explained below, doing so may result in the IRS contacting you for the supporting information since the consolidated information transmitted to the IRS will not match exactly the IRS copies they have already received (the total will match, but not the other information on the forms).
