The income adjustment box is just income. You should add up all the community income and divide by 2. If the answer is lower than your actual income then you need an addition to your income for community property.
The deductions are handled as normal in your actual return. Either you both are using standard deduction or both using itemized. If itemized, you will enter only your portion of your itemized deductions in the "Deductions and Credits" section of your return.
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