sounds correct. if you have multiple funds contributing to Box 12 then you have to figure out the total for each state based on all of them. Something else I realized is US territories are also VA exempt so if the fund had income from Puerto Rico, US Virgin Islands, Guam etc then you can put those states/amounts in also.
Here's another recent thread with a good explanation
https://ttlc.intuit.com/community/taxes/discussion/1099-b-box-12-which-state-is-your-exempt-interest...
