Yes, you can return to the California state interview after you complete your nonresident state returns. TurboTax will make the necessary adjustments based on changes to those returns.
Most states have a section for income that is treated differently. Look for business income, which should include income from Schedule K-1. (I don't have a Montana return to test this.)
Yes, carryovers follow the businesses that generated the losses in prior years. You'll need to adjust the carryovers for each nonresident state to match the source of the losses.
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