you can file them under either the "Registration Fees"...or the "Personal Property Taxes", since they end up on the same line.
Just make sure you are only entering the city/county property taxes based on the value of your vehicle.
The VA state DMV re-registration fees are not a property tax and cannot be included. Only City/County property taxes on your vehicle.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*