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@JCMA25 

Ok...I thought I explained it all above,,,but I'll try again:

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You get a 2022 1099-INT from Vanguard with $$ in boxes 1, 3, & 8........but in (say) early 2022, you bought a Muni bond, in which you paid to the seller, the interest that accrued to that bond since it's last dividend date.

Thus, after entering, or importing, the original Vanguard 1099-INT for your 2022 taxes, you need remove any $$ in boxes 8 (&13) on that original 1099-INT (leaving all the other boxes set to whatever was in them) , and create/enter a new 1099-INT...as-if from Vanguard.  That new 1099-INT contains just the box 8 $$ (&13 $$ if any) values, and then report the accrued interest, that you paid to the seller, on the follow-up page where you adjust the interest received..

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If you do not do that, and leave all the box values in the same 1099-INT....then the accrued interest you report as having been paid to the seller, will be inappropriately apportioned proportionally among boxes 1, 3 and 8, lowering the $$ reported from boxes 1, & 3 when only the $$ in box 8 need to be reduced.

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This only needs to be done in the year in which you buy an individual bond, where you pay the seller any interest that accrued up to the date you bought the bond.

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Complications:    If you buy a bond late in the year, where you pay the seller some accrued interest....and IF the first dividend you receive from that bond doesn't occur until the next year, then you have to wait until the next year's tax preparation to report the accrued interest as having been paid to the seller.

SO....if you bought your Muni bond in late 2022, but you didn't get a dividend/interest payout from that bond until 2023, then you have to wait until your 2023 taxes (prepared in 2024) to report the accrued interest that you paid to the seller of that Muni bond.