In the Online Account? Online is only good for 1 return per account. But you can use the same email address for 5 accounts. How to start another return in the Online version
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
Or if you have the Desktop CD/Download program installed on your computer you can do multiple returns. Go up to File-New.
The first return will be saved.
