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@Just-Lisa-Now- wrote:

If it were a paper filed return all IRS would see is a total amount of gambling winnings, so dont overthink it.

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But if paper filed the IRS would also see all of the attached W-2g forms that have withholding.

I don't encounter these much but folks who do just seem to aggregate them without any ill effects.  I would consider entering separately anything showing withholding but that may depend on the dollars involved.