Montana does have this filing status. "Married combined" and "married joint" is similar in that you are filing just one tax return for the two of you. TurboTax does not have a "side-by-side" comparison for this, but you can choose to select "Married, separate, combined" at the beginning of the Montana state return interview, write down the tentative refund (or amount owed), and then repeat the process using the "Married Filing Joint". You would want to chose the option that results in the higher refund (or less tax owed).
Either filing status is acceptable. My state also has this status, and usually (but not always) a couple in which both spouses have income have a better result using the "separate combined" status. But, again, not always. You will want to use the status that gives you the best refund or lowest tax due.
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