Multi class car grouping

I would like to do some multi class racing in free play. I prefer racing Gt style cars but in order to do a Imsa/Wec style race, by default, the player must chose a car that would be in the first car grouping. In turn, in order to race Gt, the faster cars must start behind the category that the player chooses to race in group one.

Please update so the player may chose a car that can race in other groupings, other than the first one.

Ex. prototype, p2 , gt. I would like to race in group three, but currently at this time, I can not. Thx