Is it possible to insert 2 records to a table with a single submit?

I'm building a conference registration cart. People can buy a registration and an exhibit table. But, if you get a table, your registration is free. So an exhibit table purchase is really two entries to the order table: a registration = $0 and a table for $450. It needs to be recorded this way so you can count how many people are coming independently of tables. Especially, since exhibitors can purchase additional registrations for co-workers.

Soooo, a buyer orders an exhibit table, submits his order and 2 items are posted. How would I code this??? Any clues on where to start?

Thanks in advance.