You can only use one method of payment (one credit card or one dining plan) per reservation if you pre-order.
You can
1) just put it all on one dining plan and figure out paying each other back over the course of the trip
2) skip pre-order and pay on 3 different dining plans there by waiting in line to order or
3) set up a TP reservation finder for a single person adr and try to book two more overlapping, one-person reservations under accounts associated with the other 2 dining plans you'd like to charge. You'd keep the 10 person adr on your account until the other two folks get the single reservations on their accounts, then decrease your size to 8 when you know you've got the other two. When they go to preorder, the single person reservation can book as many meals as they'd like for whichever members of the group should charge to their dining plans. Option 3 certainly isn't guaranteed, but it doesn't hurt to try and, if you can't get the reservations, then you still have the 10 person backed up.