Thank you, @DianeW777 ! My state is Utah, but I also worked in California.
I have tried these steps, and I am not given the option to change the state of my old car to "converted to 100% full use". It only gives me a date entry from when I stopped using the vehicle, and it says I "sold, traded-in, gave away, or stopped using" my Honda Fit (old car). Ican't seem to get Step 5 to show me the option you mentioned I should choose
