This is not something that can be easily tracked for business use percentage overall. The vehicle will need to be entered into each business activity. If you are using standard mileage rate then the business miles in each activity will be calculated accurately regardless of the overall business use percentage.
If actual expenses are being used then you may have some manual work to do to be sure the expenses are reflected accurately as well as the depreciation. Please update with more details if actual expenses are being used. My first suggestion is to enter the vehicle once in one of your businesses as an asset and use the correct business use percentage and then do not enter it again.
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