Do you have a full PC or Mac that meets the system requirements for the CD/download? If so, that would be more cost effective than using online TurboTax. With online, you only get one return per fee. With the CD/download you can prepare and e-file up to five federal and state returns, and even more if the additional ones are filed by mail.
But.....if you are only able to use online, then each user needs their own account and user ID. If you use the same account and user ID for more than one return, the second return overwrites the first one and you lose it forever.
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
https://ttlc.intuit.com/questions/1901306-how-many-times-can-i-e-file-using-the-turbotax-cd-or-downl...
https://ttlc.intuit.com/questions/2750704-what-are-the-advantages-of-the-turbotax-cd-download-softwa...
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