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The allowable portion goes on the screen labelled "Here's the income that WI handles differently." The first selection in the medical group is where you add the allowable amount. You should click on the Learn More link for additional help.

WI taxes only your WI income. As a non-resident, page 29 of Form 1NPR Instructions states:

The following describes the portion of these items that may not be used to compute the Wisconsin itemized deduction credit. 

• Medical expenses – the amount of medical care insurance and long-term care insurance claimed as a subtraction for Wisconsin. If this applies to you, complete the worksheet on the next page to figure the amount which you are allowed, if any, for purposes of the itemized deduction credit.