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.
Read here:
https://ttlc.intuit.com/community/taxes/discussion/do-i-have-to-enter-72-different-w2-g-also-how-do-...
and here:
https://ttlc.intuit.com/community/taxes/discussion/can-i-report-more-than-one-w2g-from-the-[product ...
