Tickets can not be split after the order has been placed.
The best option would be to move all the tickets to another date your entire party can visit so that you don’t lose out on those additional tickets.
Please note moving orders to another date/time does require a change fee of $3 per ticket
We recommend that if you are not 100% certain that your entire group will be able to attend at the same time on the same date that you please create separate orders as you will be unable to split tickets off of the original order.