Type 'sales tax' in the FIND window and 'Jump to sales tax'. Type in the Sales Tax Rate used for your Boat Purchase (screenshot).
When you enter your Major Purchase Info on the next screen, enter the same Sales Tax Percent you just entered (screenshot).
The correct amount of Sales Tax you paid will be calculated on the next screen (screenshot).
You can add a second Sales Tax Rate for your state for the normal amount (screenshot).
Here's more info:
https://ttlc.intuit.com/replies/3301394
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