When you purchase tickets online, you will get a seating chart. The system will select tickets for you but you can change the seats as long as they are not already taken.
I dont think all theatres will let you reserve seats. But when you buy your tickets online, it randomly selects seats for you and shows you on a chart. If you want different seats, you just click the ones you want.
I'm not sure if you can choose a seat online I think you just go to the ticket office and buy your tickets and go to the theater and set where there's one available
Thanks! Your answer is awaiting moderation.