I'm in CA and have Vanguard funds too. I manually enter mine so I don't know if the import picks up all the right amounts for US Govt Obligations. Years ago I had to make a spreadsheet to calculate the amounts each year. The Treasury fund for 80.06% is the only one of mine that now has over 50% in CA. You have to multiply the Dividends by 80.06% to get the amount to exclude.
Vanguard used to include the extra sheets with the 1099 statement but now you have to get them online to see which funds you can exclude and how much. I go though and circle all my funds. Tax information for Vanguard Funds
https://investor.vanguard.com/investor-resources-education/taxes/funds-tax-information
You probably need at least 2 of them….
US government obligations income information
Tax-exempt interest dividends by state
