Community Property Tax Adjustment (in community property state)

I live in a community property state and am filing married filing separate. My question has to do with the tax withholding adjustment (addition and subtraction question). If I had taxes withheld and my spouse did not have any taxes withheld, how do I report this on the tax withholding adjustment form in turbo tax? The spouse does not have a W-2 but has income from unemployment and a 1099-NEC. How do I figure out the addition and subtraction adjustments if the spouse didn't have any taxes withheld? I thought I would need to subtract half of my taxes withheld and enter that amount in the subtraction field but the form says I need to enter an amount less than or equal to 0. Do I put a negative number in this box (half of the taxes I paid as a negative number) and put a 0 in the addition box since the spouse paid 0 taxes withheld?

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