Once you purchase an option, like a sunroof, you should be able to deselect it or reselect it to create your custom car lines. That way you can reconfigure your line periodically to put out the desired line… Standard Edition, Luxury Edition, Sport, Limited Edition… etc.
For example, I may not want my SE to have a sunroof and only have limited features, My LE should have a sunroof plus more features and my Ltd to have panoramic sunroof plus tons of electronics and other special features… but I don’t want to keep deleting and installing each station to configure the specific vehicle model.