As long as you can get the total gambling winnings on the return to match up with the total gambling winnings reported to IRS, it will never be an issue.

Bu you shouldnt need to Override anything, just enter the total of them all on 1 W2g worksheet.   All that extra junk at the bottom that says its required for EFiling, I just complete with the info from one of the single W2gs (but Ive even left it blank and it EFiles just fine)