You are welcome Sir. Regarding your query, I will try to answer as per my understanding, knowledge and logic:
Complete details of the new car will come under the header of "Motor Vehicle (Non-Business)" [Code 7008], in part 02 of wealth statement "Personal Assets / Liabilities". When you will remove all the details of previously owned vehicle, and also mentioning gain / loss on asset regarding it, then it's chapter will be permanently closed, and chapter for new car will open.
The assets value may increase OR decrease, e.g. If you previously owned a car worth 10 lac, and you sold it for 9 lac, you will mention 1 lac in "Loss on Disposal of Assets", and afterwards, if your newly bought car is worth less than 9 lac, and all other parameters are kept same, then it's a decrease in assets value, and similarly, the same is true for vice versa.
If the new car is worth more than 9 lac (may be 10 lac, 11 lac or more) and all other parameters are kept same, then it will be increase in assets. However, if all parameters are kept same / constant, final difference / reconciled amount will never be zero!
For reconciliation or the difference to be zero, you will have to adjust your inflows / outflows, personal expenses, and play between them.
If your income / inflows are constant and the same as per last year (just for the sake of understanding, usually income / inflows are higher than previous years, especially for salaried people), and other than car, you did not buy / sell anything else, then you will only have to adjust your personal expenses and car price. If car price is high, adjust by decreasing personal expenses. Similarly, If car price is low, adjust by increasing personal expenses.
It's not necessary! You can adjust values in other headers / codes too!
I hope, it all helps. Thank you!