You are correct! The vehicle expenses have to be entered twice. The difference will be in KM driven for business but all expenses and vehicle information will be identical.
Example: you drove during the year 10000 km. Out of which 2000 for business #1 and 3000 for business #2. The rest for personal use. You need to enter full details for vehicle in each business and TTO will allocate 20% of vehicle expenses to business #1 and 30 % to business #2.