Here are options for you:
1) enter each other as traveling companions in the Medallion App (by entering each other’s booking numbers in “add traveling companion” in Dine My Way) and then once onboard make reservations for all of you at time and place desired. When seated let waiter know you will have separate checks for each cabin.
2) call the dine line on board and make reservations for 10 people. When you arrive let them know you would like separate checks.
3) make reservations in person at the venue, provide cabin numbers and let them know separate checks.
a table for 10 people might not be possible, they may have to seat you at 2 tables next to each other but they will do their best to accommodate you.