When you use Turbotax Online version, you can prepare only one return per account. This Turbotax help topic tells you how to start another return:
https://ttlc.intuit.com/questions/1894512-how-do-i-start-a-second-return-in-turbotax-onlineIf you need to prepare multiple returns, then it is cheaper to use the CD/Desktop version which you install and run on your home computer.
