Wisconsin uses the session method only if it is used on the federal return.
Note: A taxpayer must use the same method of accounting for federal and Wisconsin purposes; therefor...
As I read Pub 600 ("Wisconsin Taxation of Gambling Income"), it seems clear to me that you don't enter the results of each session into your tax return; rather, you document what you do each day, then add all the winning amounts - which is hopefully on your W-2G, and add the total into your tax return.
You are required to keep voluminous records in case you are audited. You don't want the IRS to discover discrepancies between what you document and what the casino or whoever has.
As Pub 600 says:
To use the session method, a taxpayer must be able to prove the net gain or loss from each gambling session. The proof could be detailed original statements from a casino showing the taxpayer’s betting activities, or it could be the taxpayer’s own detailed records that keep track of the amount of money they brought into each gambling session and the amount of money they brought out of each gambling session if the records were prepared at the time the sessions took place.
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