The ABA national (indoors) in Guthrie OK had a Pro section kinda.
It was open to any rider with the guts to jump it.
(Thats very very bad idea- Im not a lawyer but I’d sue the hell out of the ABA if my client gets hurt on a Pro section that they let a 14 or 15 year old minor, non pro, ride).
The old Vineland NJ track had a Expert section on the last straight. (That track basically was 2 straights (was M shapped but the 2nd and 3rd straight were very short).
But see it takes more work to make expert and pro sections and you have to have enough room and enough dirt.