Our high school has a PTO. They offer a scholarship for members kids. I am not sure what else they do. There is also alot of clubs and boosters there so I think the scholarship is the primary goal.
You sure can have a pto in high school. We don't because our high school has alot of booster clubs to raise funds for their various activities. This site is great for all grades. Good luck!!!
Our small city school system PTA council is considering switching to a PTO. In reviewing your website, I see it listed as a resource for K-8.
Can't you have a PTO in the high school? I'd love to hear from someone knowledgeable in this area.