Many folks have to file a tax return in a state they never lived in, because they received income from a source in that state.
Since you did live in Montana for awhile, file a Part-Year Resident Return there.
You don't need to make any adjustments to your W-2 entry. In the Montana interview, you will be able to indicate which wages belong to that state.
Most states start with your Federal Gross Income, then ask you for the amount that belongs to their state (or to remove the amount that does not belong to their state).
Click this link for info on Allocating Income as a Part-Year Resident.
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