Hi Danielle!
You can actually make reservations for a party of eight, (the
dining reservation tool will actually let you request up to a party of 14) BUT with a party that large, there is
always a chance that you might be split. We were a party of 7 last trip (including an infant) and we were warned that we might not be seated together, but that never happened.
If you make 2
separate reservations, one with 6 and the other with 2 (for example), you're
guaranteeing that you'll be split because the reservations won't be linked together. You can ask upon check-in at the restaurant if they'll be able to accommodate you, but it won't be guaranteed, and could dramatically increase your wait time.
Good luck and have a magical vacation!
Amanda